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Even if they don’t solve your problems, it will ensure that Apple is aware of them, and they will perhaps get addressed in the future.

If you experience problems with Time Machine or its backups in Catalina, take the trouble to contact Apple Support.

Disable Time Machine backups in the other version of macOS.

When running a dual-boot system, only enable Time Machine backups in the system which you use for most of your work (most of the time).

If you back up to networked storage and want to retain access to your old backups from previous versions of macOS, follow a similar course to ensure that your Catalina backups go into a new backup set.

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If you experience problems with Time Machine backups in Catalina, turn it off, archive your old backups, then turn it back on to use a new backup set.

Once you have upgraded, turn Time Machine back on but using a new backup set which won’t then be accessible from macOS 10.14.x or earlier.

Before upgrading to Catalina, make one last backup (or two!), then turn Time Machine off.

My summary recommendations are therefore: Dual-boot systems don’t fit very well with Time Machine anyway, and you should avoid trying to run Time Machine backups in both versions of macOS for these reasons.

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This is also a wise choice if you want to run your Mac as a dual-boot system, perhaps being able to boot back into Mojave for occasional use of 32-bit apps which Catalina has rendered inaccessible. Giving it a clean start also means that your existing backups shouldn’t be converted to the new format, allowing you access to them if you needed to revert to Mojave, for instance.

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As all system files are replaced, most other files change paths, and Catalina has a complete new layout on two APFS volumes, the first backup after upgrading is likely to approach the size of a full backup anyway. There are good reasons for creating a new backup set for Catalina anyway. The best answer then is to start a new backup set, if possible. A range of problems have been reported by some users, typically that Time Machine refuses to make any new backups to an existing backup set. Many users have had no problems with their Time Machine backups following upgrading to Catalina. backupbundle can still be mounted using an older DiskImageMounter app in /System/Library/CoreServices, although whether you can use Time Machine to retrieve any of its contents remains unclear. Once they have been changed, they can no longer be accessed from any earlier version of macOS, at least not recognised as containing a Time Machine backup. backupbundle to reflect their being updated for 10.15. If you back up to a Time Capsule – or to another networked storage device – it appears that this change is reflected in the extension used by Time Machine backups, which change from being.

Unfortunately, Apple doesn’t appear to document Time Machine for developers or advanced users, so that is all that I can find at present. New backups that are created can be used only on macOS Catalina.” In one Help page, Apple points out that “if you create a backup on a Mac or partition with macOS Catalina, you can only use that backup on Mac computers or partitions with macOS Catalina.”Īdditionally, in this article: “If you upgraded to macOS Catalina on a Mac that uses a Time Capsule or other network storage device as the backup destination, your existing backups are also upgraded and can be used only on macOS Catalina. In this article I try to pass on what has changed, and how you can best address problems if they arise.Īpple’s documentation hints that something has changed, but doesn’t explain what.

However, the version of Time Machine included in 10.15 doesn’t work the same as that in Mojave, and some users are reporting problems with their backups when upgrading to Catalina. Although some of us were hoping that Catalina would support making Time Machine backups to APFS volumes, it doesn’t.