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Finally moved family off Google Photos to Immich on a closet Optiplex 7040 — almost lost a month of kid photos in January
I did something similar. My db-backups were corrupted on creation (I had no idea, the disk had partial disk corruption), and this went on for a few months before the entire disk gave up.
Since both the server and the backups were corrupted I lost my 3 year old Matrix server + a few websites and services xD
That was not a fun week :)
TLDR: Test your backups once in a while