I'm more in search of a sync tool than a backup tool. I'm aware that I can just copy the whole Calibre folder onto a flash drive, but if I only acquire 5-10 new books between backups, I'm essentially re-copying the same 95% of files over and over. Ideally, I'd have something that just does the deltas.
The other rub is that my house is multi-platform, so my main library lives on a Linux laptop, but I've also got a Windows HTPC that serves as a media center (and hence backup #1 for all my stuff), in addition to other external hard-drives for secondary and tertiary backups.
So from Linux -> thumb-drive or Linux -> backup HDD, I can do something like an rsync,
and perhaps from thumb-drive -> Windows HTPC could be SyncToy,
But ideally it would be nice if I could just have my primary Calibre library exported to a thumb-drive, and from there use a built-in option to "sync" the Calibre libraries between source and destination until they're all in sync.
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