A bit oddly, I was under the impression that One Drive synced files in real time. To quote from Microsoft's documentation:
Quote:
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If you add, change, or delete a file or folder in your OneDrive folder, the file or folder is added, changed, or deleted on the OneDrive website and vice versa. You can work with your synced files directly in File Explorer and access your files even when you’re offline. Whenever you’re online, any changes that you or others make will sync automatically.
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In my admittedly limited testing, with a small calibre library synced to One Drive, changes I made were synced in real time. Not using only the local file only until I finished but syncing in real <expletive deleted> time. I could click on the One Drive icon and pause syncing while I had calibre open or I could the calibre library to a directory that was not being synced and then copy it back afterwards. I played with batch files to do both of those but then went back to the safety of local use only with a backup to multiple locations when calibre was not running. If you want to take a look at the network activity, WireShark comes in handy.
BTW, if you don't mind my asking, what is your IT background?