I have my Calibre library - and lots of other stuff - autosynced to the much maligned but actually superb MEGA service where some small fee gets me 8 TB to play

I have my Calibre library - and lots of other stuff - autosynced to the much maligned but actually superb MEGA service where some small fee gets me 8 TB to play with. So stuff is instantly retrievable on various phones and secondary PC's. If I really need sync of progress, I either rely on something called memory, or work from Calibre's built-in webserver.