[blaenk]

Do you guys know where I can suggest this as a feature, to gauge how receptive the developers may be in accepting a patch for it if I implemented it myself?

There might be some settings for your sync software to ignore some filetypes. That could perhaps be used to avoid having some specific book formats copied?

Also it may be dangerous to have other programs working on the calibre library while calibre is running. If something serious should happen to the library, the synced copy of the library may not be fully/immediately usable and a restore becomes unnecessarily difficult. I recommend that you shut down the sync software while you have calibre running.

Thanks for the response. I'm using dropbox which unfortunately doesn't have any such feature as far as I'm aware. Thanks for the heads up, but I don't think I have to worry about it corrupting anything thankfully. If that ever did happen I could just revert to the previously saved version. That said, it's not bad to keep in mind, thanks.

You can always leave the AZW3 in and once it is synced once, it shouldn't need to be synced again.

Thanks but that's actually what I'm trying to avoid. Like I said, I have a very slow upload speed and many of my books are megabytes in size. Not only does it take a prohibitively long time, but my entire connection slows to a crawl; it's a mess.