@Kevan - I've used Goodsync for 10+ years. I sync daily to a local USB3 disk dock, and weekly to a commercial FTP service.
FreeFileSync is used by quite a few calibre users to sync locally and/or to services such as Dropbox, OneDrive etc. Today, I'd probably go with FFS if I were making the decision I made 10-12 years ago.
BR
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