[nikev]

Originally Posted by DNSB

Now there is a very, very bad idea. Keeping your calibre library on Dropbox or any cloud storage is a matter of when not if bad things will happen. For one recent discussion, see My Calibre Library is Blank and won't accept the old location in the calibre forum.

You may also want to check the calibre FAQs for I am getting errors with my calibre library on a networked drive/NAS?. The first line of item is: Do not put your calibre library on a networked drive.

Thanks for the tip.

That Calibre FAQ says further down that file syncing mechanisms like Dropbox or rsync are okay! Personally, I have been using Dropbox for at least two years without event. Otherwise it is a nuisance to get books from one machine to another.