Hello @Ian_Ramsay,
Thank you for the update. We hope the search in the “cats lair” proves successful!
As a general recommendation, we always suggest maintaining backups in at least two different locations (for example, a USB drive and a network folder or cloud storage). This ensures your library data remains safe even if a physical drive goes missing or fails.
Regarding the investigation: please don’t worry too much if you cannot locate that specific backup. We have requested similar data from other affected users to help our R&D team identify the pattern.
However, if you do find it, we highly recommend saving a copy of that backup from before the dates became incorrect. This will give you the option to restore your library to its proper state once our team identifies a fix or a workaround.