![]() eventdb as well as those for clones named. ![]() For good measure, Catalina also makes and maintains backups of the Recovery volume, including boot.efi, the Base System, diagnostics, and its other components.Īlthough the structure of the Backups.backupdb folder remains essentially the same as in Mojave, inside each backup folder you will find event-based data in files with names of. One obvious change in Catalina’s Time Machine is that it’s no longer backing up a single volume such as Macintosh HD, but has both the boot System and Data volumes to include, unless you opt for backups to exclude the read-only System volume. This new system continued through Mojave, but appears to have changed yet again in Catalina. In High Sierra, this changed so that, when backing up APFS volumes, Time Machine made a snapshot of that volume, compared it with the previous snapshot made for the last backup, and worked out what had changed, thus what needed to be backed up. Before Apple introduced its new file system APFS, Time Machine worked out what to back up using the hidden database of file system events, FSEvents.
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