[higlider]

I currently copy my calibre DB to DropBox and run C2O on the DropBox copy. Calibre runs on its own DB not in DropBox. Thus I know my calibre DB can't get corrupted. I suspect that if two users ran Calibre on the same DropBox DB, it could get corrupted and eventually would get corrupted unless there is some provision for preventing simultaneous write access. I doubt DropBox prevents it, it is users beware, just as Google Docs is. I have experienced issues with simultaneous changes to a Google spreadsheet.

I haven't seen warnings about this, and Calibre2Opds documentation suggests just moving your Calibre DB permanently to DropBox, then all you need is another Calibre to access the same DB. So I thought I would raise this issue.

Rather than copy the whole Calibre DB each update to DropBox, I tried just exporting the new books to DropBox and separately copy the metadata.db file. But guesss what? When you run Calibre2Opds and look at your catalog, the new books have default covers, because in the original Calibre book folders, the cover is called "cover.jpg", but in an exported book (multiple folder export), the cover is called "author-book_title.jpg", so the cover can't be found. Maybe a new command under Calibre write to disk could be to Update Cloud Directory and/or in Calibre2Opds.