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    Mar 03, 2020 6 minutes

    Email Mac|Life at ask@maclife.com

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    > Preserving your old Time Machine backups in Catalina

    I’m preparing to upgrade to macOS Catalina, but gather it upgrades Time Machine backups so they can’t be accessed from older versions of macOS. How can I prevent that?

    Time Machine backups have changed in Catalina, and Apple warns users that all backups made by, and converted for, 10.15 won’t work with previous versions of macOS, even Mojave…

    This is partly because, in Catalina, backups contain three volumes instead of the single boot volume: one for the writable Data volume, another for the read–only System volume unless you decide not to back that up, and a third for Recovery, which is normally invisible as it’s not mounted. In addition to this, Catalina uses different methods to determine what it should back up. These include using snapshots when backing up an APFS volume, with the option of using macOS’s internal database of changes made to the file system, on both APFS and those

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