I have just updated the plugin to v1.8.2. The changes are:
- New: Add option to do backup each time the device is connected.
- Fix: Error building list of shelves when fetching from device.
- Fix: Update menu handling for calibre 2.10 and later.
The extra backup option is on the configuration dialog. You have the choice of doing the backup on every connection or once a day. This does not affect how many backups are kept. It is the number of copies, not how many days to keep the backups.
The fetching shelves problem is the one reported by ebookskippy. It deserves a definite

on my part.
The last problem is due to a recent change in calibre to work better with the menuing system on one of the Linux distributions. I haven't had a report of the problem, but I could see something wrong with the way I was handling it.
As usual, calibre will announce the update in the next hour or so. If there are any problems, please report them here. And the same goes if you have any suggestions or questions.