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https://www.minitool.com/data-recovery/fix-time-machine-stuck-preparing-backup-mac.html
#1: Stop the Currently Failing Backup Attempt Click on the Apple icon in the menu bar Select System Preferences. Choose Time Machine. You can also click on the Time Machine icon directly (if it appears in the menu bar) to access the... Click on the X button on the right side of the progress bar ...
https://www.lifewire.com/troubleshoot-time-machine-stuck-on-preparing-backup-2259980
With Time Machine still turned off, open a Finder window and navigate to: /TimeMachineBackupDrive/Backups.backupdb/NameOfBackup/. This path needs a bit of explaining. TimeMachineBackup is the name of the drive you're using to store your backups on. In our case, the Time Machine drive name is Tardis.
https://discussions.apple.com/thread/8332439
To start the conversation again, simply ask a new question. Why does "preparing backup" take hours? I use a Seagate 1TB drive for backup. I back up about once a month (I know, not often enough!). When I plug in the drive and initiate a Time Machine backup, it takes hours to "prepare backup". I back up about 300 GB.
https://appletoolbox.com/how-to-fix-time-machine-when-it-freezes-on-preparing-backup/
When your Mac completes all of the above steps, you can try attempting a backup as usual. Click the Time Machine icon in the top menu bar. Alternatively, go to Apple Menu > System Preferences > Time Machine. Click Back Up Now.
https://www.imyfone.com/mac-tips/time-machine-stuck-on-preparing-backup-fix/
Phase 1: Stop the Frozen Backup Progress To do this, you should open the “Time Machine” settings and go to System Preferences. Then, you should click on the small ‘X’ mark and stop the ongoing process. If the backup progress bar disappears and you don’t see “Preparing backup” option anymore, you can ...
https://support.apple.com/en-us/HT204412
Select your backup disk in the Finder. Choose File > Get Info from the menu bar, then look for the information labeled Format. If the format isn't APFS, but you want improved Time Machine performance, use Disk Utility to erase the backup disk using the APFS format.
https://www.tenorshare.com/whatsapp-tips/whatsapp-chat-backup-stuck-how-to-fix.html
Select Backup option on the side toolbar. Next, choose your backup device and click "Back Up Now". The whole process will take a few minutes. It depends on the size of backup file. Last, your WhatsApp backup will be backed up to your computer. You can also view or export the data. With only 3 steps, you can easily backup WhatsApp data without any hassle.
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