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Explore Stack InternalAs noted here you can't access the Time Machine backup from your Big Sur machine on Catalina:
Not only must you use Big Sur to back up to an APFS-formatted Time Machine volume, you can’t even access the backups from a Mac with Catalina or an earlier macOS version installed.
You will have to bring a newer os to your existing machine to temporarily boot it, upgrade (which you expressed a preference to not do) or bring the data to another machine to move it.
As noted here you can't access the Time Machine backup from your Big Sur machine on Catalina:
Not only must you use Big Sur to back up to an APFS-formatted Time Machine volume, you can’t even access the backups from a Mac with Catalina or an earlier macOS version installed.
As noted here you can't access the Time Machine backup from your Big Sur machine on Catalina:
Not only must you use Big Sur to back up to an APFS-formatted Time Machine volume, you can’t even access the backups from a Mac with Catalina or an earlier macOS version installed.
You will have to bring a newer os to your existing machine to temporarily boot it, upgrade (which you expressed a preference to not do) or bring the data to another machine to move it.
As noted here you can't access the Time Machine backup from your Big Sur machine on Catalina:
Not only must you use Big Sur to back up to an APFS-formatted Time Machine volume, you can’t even access the backups from a Mac with Catalina or an earlier macOS version installed.
