About Time Machine For Mac


When it comes to backing up your files on your Mac, one of the most popular and convenient options is the Time Machine. You can choose to back up your files to an external drive attached to your Mac or to a remote backup drive, such as Apple’s Time Capsule.

Time Machine is a great tool for creating backups because it works well with Macs. You need to set it up only once and you can forget about it because all the processes can be automated or scheduled. But it doesn’t mean that this built-in backup feature is not without flaws.

  • Rebuild Outlook for MAC after Time Machine restore. I had to reinstall OS and restore from a Time Machine backup. I got everything back except my email folders and emails that were stored in the 'On My Computer' section of Outlook. If I search my disk I find files KIND =.olk15meessage and if I click these they open in Outlook and these are my.
  • Time Machine via Physical Drive. For Mac users using Time Machine with physical drives, such as a USB or external drive, here are the things you can do: Disconnect the drive from your Mac, close Time Machine. Reconnect the drive to your Mac, then run Time Machine once again. Use a different USB port or cable if necessary.
  • Silicon Power 2TB Armor A65M for Mac Military-Grade Shockproof USB 3.0 2.5-inch External Hard Drive- HFS+ and Time Machine Supported, Gray 4.4 out of 5 stars 1,491 $72.99 $ 72.

Time Machine is a backup software application distributed as part of macOS, desktop operating system developed by Apple.The software is designed to work with AirPort Time Capsule, the Wi-Fi router with built-in hard disk, as well as other internal and external disk drives.It was introduced in Mac OS X Leopard. Time Machine is the part of macOS that allows you to easily back up your Mac to an external or networked hard drive. Here are some of the most asked questions about Time Machine, such as what size hard drive do you need, can you exclude files from the backup, and how do.

A common problem often encountered when using Time Machine is error 45. macOS is not so good at reporting errors so it is challenging to determine what the error is all about and what triggered it. So if you’re just like the other Mac users hit by this error and looking for the right solution, then this article is for you.

What is Error 45 in Time Machine?

Error 45 happens when Time Machine is not able to complete the backup process due to some issues. It usually appears when you’re trying to manually save your backup files, but it can also occur during scheduled backups.

What makes this error troublesome is that the error doesn’t seem to care where the files are being saved to. Mac users who are using physical and remote drives all fall victim to this error. This means that the error may not be related to the destination backup drive, especially when you look at the error messages that accompany this error, such as:

  • Time Machine couldn’t complete the backup to “Volume.”
    The backup disk image “/Volumes/.timemachine/XXXX’s AirPort Time Capsule._afpovertcp._tcp.local./0FC04105-0B94-4D2A-9BBF-B4E10A14D65C/Data/iMac-10DDB1B2FF81 (2).backupbundle” could not be accessed (error 45).
  • Time Machine could not complete the backup.
    The backup disk image “/Volumes/backups/xxxx.sparsebundle” could not be created (error 45).

This error can pop up regardless of what macOS version the Mac is running on. However, the majority of the affected users only encountered this error after upgrading their Macs to macOS Catalina, suggesting that this error might be caused by the update.

Error 45 can cause a lot of inconveniences and is actually contrary to what Time Machine wants to achieve — which is a hassle-free backup process.

What Causes Error 45 in Time Machine?

If you’re using a backup drive located in the same network, such as Netgear’s Stora or Apple’s Time Capsule, then the problem is probably related to your network. Your Mac is not able to connect properly to the remote storage, hence the backup process could not proceed.

In cases where the backup process has been initiated but was stopped by error 45, the issue here might be triggered by unstable network connection, insufficient space on the backup drive, or a simple glitch in the backup process. In these instances, restarting Time Machine usually resolves the error pretty quickly.

For users who are using physical drives for their backup, it is possible that the drive is not properly connected to the Mac, making it impossible for the backup process to proceed. There are cases also when the error pops up when Time Machine is running a scheduled backup then the computer suddenly goes to sleep. Ideally, Time Machine should continue running in the background. But for some reason, the process gets interrupted when the machine goes to sleep.

Corrupted files, insufficient storage, and malware can also cause error 45 to occur when using Time Machine with an external drive.

If you encountered the error after upgrading to macOS Catalina, then the update probably broke something in the Time Machine backup process and you have no choice but to wait for the official fix from Apple. In the meantime, you can use other third-party backup solutions while Apple is sorting this error out.

How to Fix Error 45 in Time Machine on Mac

There are different ways to deal with this Time Machine error, depending on the type of backup storage you are using. But before we proceed to the specific solutions, let us look first into the basic troubleshooting steps you can apply when faced with error 45:

  • Check your internet connection. Make sure you have a stable connection for the backup process to successfully complete. Switch to a wired connection, if possible, or find a spot with a strong Wi-Fi signal while the backup process is going on.
  • Make sure you have enough storage space on the backup drive. This step is very important, particularly for those who are using networked drives connected to other Macs. You might not be aware of how much data is being saved from the other devices so you need to regularly check the available disk space. This also applies to Macs using external drives for backup. If you don’t have enough storage, clean up the drive using Outbyte MacRepair to make room for other backups.
  • Scan for malware. Copying corrupted or infected files to your backup drive can be devastating because it will infect all your backups. To avoid this, make it a habit to run a scan before initiating the backup process.

If the above steps don’t work, you can try the solutions below depending on what type of backup you are using.

Time Machine via Physical Drive

For Mac users using Time Machine with physical drives, such as a USB or external drive, here are the things you can do:

  1. Disconnect the drive from your Mac, close Time Machine. Reconnect the drive to your Mac, then run Time Machine once again.
  2. Use a different USB port or cable if necessary.
  3. Use a different drive to check whether your drive is corrupted or damaged.

Time Machine via Networked Drive

If you’re using a drive connected to your network, here are the steps you can take:

  1. Make sure your storage is available on your network. If you’re using Apple’s Time Capsule, launch Airport Utility in the Utilities folder. Scan for available wireless devices. If you can’t find Time Capsule, turn it off then back on again.
  2. Reselect your Time Machine backup. Sign in to your Mac using an administrator account.​ Launch System Preferences from the Apple menu, then choose Time Machine. Turn Time Machine off, then click Select Disk.​ Look for your Time Capsule or NAS drive, set it as your Time Machine volume, then type in the correct password. Turn Time Machine back on. You should now be able to successfully perform backups.


Time Machine is set-and-forget backup tool for Macs, which ensures that your important files are saved, even without any further action from you. But if you encounter the error 45 when macOS performs backups, the above steps should help you fix the problem and allow you to complete your Time Machine backup tasks successfully.

If you’re running into errors and your system is suspiciously slow, your computer needs some maintenance work. Download Outbyte PC Repair for Windows, Outbyte Antivirus for Windows, or Outbyte MacRepair for macOS to resolve common computer performance issues. Fix computer troubles by downloading the compatible tool for your device.
See more information about Outbyte and uninstall instructions. Please review EULA and Privacy Policy.

Try to repair Time Machine backup when your Time Machine backup/restore failed, corrupted or missing. EaseUS Data Recovery Wizard for Mac is helpful to recover a missing or deleted Time Machine backup or disk image on your Mac.

Time Machine Backup/Restore Failed

Mac users, who're currently running macOS Catalina or Mojave, report that they got an issue with Time Machine. Mainly, it's about Time Machine backup failed to back up the scheduled files to the configured backup disks, let it be the Time Capsule drive or third-party drive. Hence, how to repair Time Machine backup becomes the topic we're going to discuss here.

You can read on or jump to the issue & solution you're most concerned about.

Workable SolutionsStep-by-step Troubleshooting
Issue 1. Can't Backup or RestoreCheck Time Machine system requirements > check your Mac...Full steps
Issue 2. Backup CorruptedCreate a new backup > restart Time Machine > repair with terminal command...Full steps
Issue 3. Backup MissingDownload software to recover missing backups > repair unrecognized...Full steps

Issue 1. Can't Backup or Restore Your Mac Using Time Machine

One phenomenon to get Time Machine backup failed is that you can't back up or access an existing Time Machine backup, or restore from an earlier backup won't work. According to Apple's official instructions (https://support.apple.com/en-us/HT204157), when you have a problem with Time Machine, check these things if you see an alert that Time Machine is unable to back up your data, or if you can't select your backup disk in Time Machine preferences.

Fix 1. Check Time Machine System Requirements

  • External hard drive connected to a USB, FireWire, or Thunderbolt port on your Mac
  • Time Capsule or macOS Server on your network
  • External hard drive connected to the USB port of an AirPort Extreme Base Station (802.11ac) on your network

Fix 2. Check Your Mac

  • Make sure that your Mac software is up to date.
  • Restart your Mac and see if the issue continues.

Fix 3. Check your AirPort Base Station

  • If you're using an AirPort Time Capsule or a drive connected to an AirPort Extreme Base Station, make sure that your AirPort firmware is up to date.
  • Restart your base station and see if the issue continues. To restart, unplug the base station from AC power for 5 seconds, then plug it back in.

Fix 4. Check Your Network Connection

If you back up to a server, AirPort Time Capsule, or drive connected to your AirPort Extreme Base Station, make sure that your Mac is connected to the same network as your backup drive. You can select your wireless network from the Wi-Fi status menu.

Fix 5. Check Your Backup

If you back up to a server, AirPort Time Capsule, or drive connected to your AirPort Extreme Base Station, make sure that your current Time Machine backup doesn't have any issues that could prevent further backups:

  • While holding down the Option key on your keyboard, click the Time Machine menu in the menu bar, then choose Verify Backups.
  • If Time Machine finds an issue with your backup, it displays a message with details. Follow the onscreen instructions.

Fix 6. Check Your Drives

  • If you're using a drive connected to a port on your Mac or AirPort Extreme Base Station, make sure that the drive is turned on.
  • If you're using a USB hub or a similar device, try connecting the drive directly to your Mac or base station.
  • If you're backing up to an external third-party drive, check with the drive manufacturer to make sure the drive's firmware is up to date.
  • If you're backing up to an external drive, check the formatting of the drive. Time Machine requires that an external drive be formatted like a Mac startup disk: Mac OS Extended (Journaled) with a GUID Partition Table (GPT). If you select a differently formatted drive for use with Time Machine, your Mac automatically prompts you to erase it for Time Machine.
  • Reformatting a disk erases all data stored on the disk, so you might want to move important files to another disk first.

If your drive is already formatted correctly, turn off Time Machine, then check it for problems:

  • To check the drive of an AirPort Time Capsule, follow the steps to verify an AirPort Time Capsule drive.
  • To check an external drive connected to your Mac, open Disk Utility from the Utilities folder of your Applications folder. Then use the First Aid feature in Disk Utility to verify your disk. Do this for your startup disk as well.
  • You can turn Time Machine back on after your drives are verified or repaired successfully.

Issue 2. Time Machine Backup Is Corrupted

About time machine for mac os

What's a corrupted Time Machine backup? Below are some backup corruption symptoms.

  • Fail to complete Time Machine backup
  • can't access time machine backups
  • Time Machine keeps asking to create new backups
  • Searching for time machine backups taking forever
  • Time Machine disk or external device becomes unrecognized

How to repair a corrupted Time Machine backup? According to some experienced users and professional geeks, when Time Machine corrupted, it can be fixed by the following four troubleshooting methods.

Fix 1. Create New Backup

If Time Machine keeps asking you to create new backups, click Create new backup to start the new backup then. So that it can work smoothly later.

Fix 2. Restart Time Machine

Restart Time Machine several times may also help. You may need to switch Time Machine to On-Off-On and then reboot the Time Machine again.

About time machine for mac backup

Fix 3. Swap out The Hard Drive

Another solution to repair Time Machine is to set up a new external hard drive with Time Machine as a backup drive.

Fix 4. Repair Corrupted Time Machine with Terminal command

If Time Machine stops responding or even not working on Mac, to repair the corrupted Time Machine becomes tough yet still resolvable with Terminal command.

Before starting the process, You should stop Time Machine: Time Machine Preferences > Toggle Time Machine 'OFF'.
  • Step 1: Open Terminal on Mac and type: $ sudo su - and hit Return.
  • Step 2: Type: $ chflags -R nouchg '/Volumes/.sparsebundle' and hit Return.
  • If you don't know the TM name, go to Time Machine Prefernces and check out. Or type: $ ls '/Volumes/ and hit Return.
  • Step 3: Type: $ hdiutil attach -nomount -readwrite -noverify -noautofsck '/Volumes/.sparsebundle' and hit Return.
  • Step 4: Type the below command and hit Return each time:
    /dev/disk5 GUID_partition_scheme
    /dev/disk5s1 EFI
    /dev/disk5s2 Apple_HFS
  • Step 5: Type: $ fsck_hfs -drfy /dev/diskxs2 and hit Return. After this, if you receive 'The volume was repaired successfully', congratulations.
    But if Terminal warns you 'The volume could not be repaired', relax and continue with next command.
  • Step 6: Type: $ fsck_hfs -p /dev/diskxs2 and hit Return.
  • Step 7: Type: $ fsck_hfs -drfy /dev/diskxs2 and hit Return. Wait for the process to complete.
  • Step 8: Type: $ vi '/Volumes//.sparsebundle/com.apple.TimeMachine.MachineID.plist' and hit Return.
    Change the value of integer from 2 to 0 within that file.

Issue 3. Time Machine Backups Missing

When you cannot access to Time Machine or Time Machine corrupted, you are highly recommended to get backup data back first. How?

Fix 1. Recover Missing Backup Image with Software

About Time Machine For Macs

If the Time Machine backup disk can be opened but nothing appears, the best way is to scan and restore all lost Time Machines' Backups.backupdb files. Here we'd like to recommend you try EaseUS Data Recovery Wizard for Mac which supports users to restore all lost data from different situations within only 3 steps. Download EaseUS Data Recovery Wizard for Mac and restore Time Machine backups now:

Step 1. Select the disk location (it can be an internal HDD/SSD or a removable storage device) where you lost data and files. Click the 'Scan' button.

Step 2. EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane.

Step 3. In the scan results, select the file(s) and click the 'Recover Now' button to have them back.

What's more, if you lost files on Mac or external storage devices, you can also apply EaseUS Mac data recovery software to easily recover files on Mac without Time Machine backup.

Fix 2. Repair Unrecognized Time Machine Drive

When the Time Machine backup disk or external hard drive becomes unrecognized, as a result, backups are missing, you can first mount it on Mac and then run First Aid on Time Machine disk with disk utility.

Step 1: Connect the Time Machine backup external hard drive to Mac. Launch Disk Utility, check external hard drive at the left panel.

About Time Machine For Mac Os

You'll see that the external hard drive is greyed out, marked as untitled. (Untitled means unmounted on Mac computer.)

Step 2: Select the untitled external hard drive and click the 'Mount' button from the Disk Utility bar.

Step 3: Select Time Machine drive at drive level on the left panel of Disk Utility and run First Aid.

Step 4: Select Time Machine drive at volume level and run First Aid.

About Time Machine For Macbook Air

Wait for the process completes, check if Mac computer can recognize your backup disk and open it in Time Machine again.


Restore From Time Machine Mac

Regarding the topic 'Time Machine backup failed' and 'how to repair Time Machine backup', we gathered all feasible solutions to help you resolve the various issues with Time Machine on your Mac. If you have further Time Machine problems, click for more Time Machine guidelines from the following collection.