Time Machine external drive with catalina and big sur snapshots

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Level 1

4 points

Time Machine external drive with catalina and big sur snapshots

I just bought iMac 27" 2020 (the last iMac with Intel) in early 2021. So far I had resisted upgrading to Big Sur.

It is now April 2021 and I am ready to make the big jump. But I have read about issues with Time Machine backups with Catalina and Big Sur. Currently I have Time Machine backups for my Catalina snapshots.

"After" I upgrade from Catalina to Big Sur, would I be able to backup my Big Sur snapshots into my existing TM external drive with Catalina backups? I hope that I would be able to "roll back" to my Catalina backup in case I got issues with my upgrade to Big Sur?

iMac 27″, macOS 10.15

Posted on Apr 24, 2021 1:49 PM

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Answer 1

May 1, 2021 8:25 PM in response to tbirdvet

2016 15” MBP Mojave

bought a new EHD for my first TM backup ( will arrive Monday) . Been using superduper to create clones. Once I get a few TM backups want to upgrade to Big Sur ( so after most recent iOS update phone won’t sync or connect w iTunes to sync thus need to move to Big Sur )

EHD to be formatted HFS+ for MOJAVE TM

when I upgrade to Big Sur do I need another EHD for Big Sur TM backups?

will my new EHD be compatible with Big Sur TM backups?

should I partition the new drive?

get a separate EHD for Big Sur?

buy a second EHD??

thinking new file system in Big Sur NOT compatible with my HFS+ Mojave TM

how to format EHD ? If not HFS+

thank you for any help and direction

share without partitioning ??

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Answer 2

tbirdvet

Level 6

14,423 points

Apr 24, 2021 4:39 PM in response to ciriuss

You should be able to do that. I have a TM with Big Sur and Mojave.

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Time Machine external drive with catalina and big sur snapshots

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