I back up all me ebooks (original drm file, and any converted files, plus calibre library). Back up to a network drive and also to online storage (idrive.com).
All my backup jobs are scheduled to run nightly, so I never lose more than a days worth of changes/additions. imo, with online storage being so cheap these days, it is silly not to have an offsite (online) backup.
Most importantly - make sure you test your backups every now and then to make sure:
1. they are acutally backing up
2. you can actually retrieve your backed up files
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