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Time Machine getting stuck at 'preparing backup' after OS update to Catalina

After updating to Catalina, my iMac gets stuck at 'Preparing Bakckup' in Time Machine - and won't back up. It did it once after the OS update, but won't do it again. I've ejected the disk and restarted several times.

Any ideas?

iMac 27″, macOS 10.15

Posted on Apr 10, 2022 6:24 AM

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Question marked as Top-ranking reply

Posted on Apr 10, 2022 8:21 AM

I suggest starting with this support article: If a Time Machine backup takes longer than you expect - Apple Support


You may also find this article helpful: What to Do When Time Machine Is Stuck on "Preparing Backup" - Lifewire

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Time Machine getting stuck at 'preparing backup' after OS update to Catalina

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