You are not alone on the issue like Time Machine Stuck on Preparing Backup on Mac with MacOS Mojave. Don’t worry; the Solution is so simple, Just the process and Remove the in-progress file from Drive. Now Fresh restart backup using TM. Time Machine is far better and efficient way back up your Mac compared to other third-party tools. You can take regular backup and set the Time Machine to take backup automatically, and for sure it will complete without any errors. In some rare cases, Time Machine stuck on “Preparing Backup” for a long amount of time.
It might be possible that you haven’t taken backup for few months and now time machine stuck on preparing the backup. Another reason is you are taking backup of the large drive so it is stuck or much more reasons we can guess. Instead, we should try to fix the time machine stuck in preparing the backup. Let’s do this.
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Solution of this issues is the same for the All Mac devices: iMac, Mac Mini, MacBook Pro, MacBook Air.
Troubleshooting guide on Time Machine Stuck On Preparing Backup: Force Start Backup
Fix 1: Stop the currently failing backup
First off we will cancel the currently stuck backup on Preparing Backup. It is quite easy.
Step 1: Tap “Apple” icon and open “System Preferences”.
Step 2: From there click on “Time Machine”.
Step 3: Now, cancel the backup in progress by clicking on (x).
Step 4: If you no longer find “Preparing Backup…” then go ahead.
Fix 2: Delete the “In Progress” file from The Time Machine Folder
After canceling the backup, it’s time to remove that corrupt in progress file from the system.
Step 1: From the “Finder”, Find the “Time Machine” Drive and open “Backups.backupd” folder.
Step 2: Next, open the folder which is named with your current Mac.
Step 3: Now search for the file contains .inProgress extension.
Step 4: Delete that in Progress file.
Fix 3: Restart Mac with the Time Machine Drive connected
Now, simply restart the Mac but don’t remove Time Machine Drive from the Mac.
Step 1: Drop down the “Apple” icon and tap on “Restart”. Don’t disconnect time machine drive.
Step 2: Give some time to “Spotlight” to run completely.
This action will cause macOS to re-index the file attached to time machine drive.
This can be one of the reasons why you are time machine stuck on preparing the backup. Or if the time machine drive is indexed by the spotlight then also we will need a good restart.
Fix 4: Take Backup as usual to remove Time Machine Stuck On Preparing Backup
Now after trying above to fixes, you must take backup normally. Don’t forget to connect the Time Machine Drive to your Mac.
Step #1: Go to the “Apple” icon.
Step #2: Open “Time Machine” followed by “System Preferences”.
Step #3: Tap “Back Up” Now.
Again you will see “Preparing backup” on the screen, but don’t worry it will be gone after some time. It depends on the speed of your mac, the hard drive and the size of the data.
Also Useful: Alternate Ways to take a Backup on Mac.
Hope you got the fix and Troubleshooting tips on what my Mac Taking too much time in Time Machine Backup. Terminate the Backup process and Restart the Backup on the Backup drive.