This left Time Machine backups in a strange state which clearly was far from desirable.Īttempts to bring this back into line were unsuccessful.
It also decided to continue the previous backup set under the volume name of “External1 1”, but without adding any new data to it. It therefore started a new backup set for the volume named External1, and promptly backed up nearly 700,000 files totalling 530 GB to it. I then removed External1 from the exclusion list, and TMA decided that was a prompt for it to automatically perform a manual backup of External1 as if it had never seen that volume before. The reason for that isn’t clear, but log entries reveal confusion:ġ9:59:13.619 Backing up to ThunderBay2 (/dev/disk7s2,6): /Volumes/ThunderBay2ġ9:59:13.620 Found matching machine store '/Volumes/ThunderBay2' for computer named 'Howard’s iMac Pro', no machine store inheritance neededġ9:59:13.703 Backup failed (25: BACKUP_FAILED_NO_SOURCE_VOLUMES - No source volumes were found to back up.) Its first backup was abandoned, because it had apparently added External1 to its exclusion list. Time Machine wasn’t so easily fooled, though. My backup scripts in ChronoSync and Carbon Copy Cloner needed the volume name to be refreshed, which I quickly accomplished. I then shut down, swapped the external disks, started up and quickly changed the volume name of External3 to External1. I needed to upgrade that external SSD from 1 to 2 TB, so prepared a new disk with the name External3 to replace External1. Apart from settings in Photos and a Finder alias, there’s no formal connection from the external SSD to my Home folder, but plenty of apps rely on its path. My Home folder effectively sprawls across two disks: the Data volume on my internal storage, and a folder on an external SSD. In the last few days, I’ve been looking at different scenarios involving disks changing, and what happens to Time Machine backups made to APFS disks (TMA).
These are changes which Time Machine needs to cope with, just as other backup utilities do. Some fail, others become full, or we may simply reconfigure our system. With the exception of internal storage, disks involved in Time Machine backups are likely to change.
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