Server 2.5.1 WIP/Client 2.5.1 WIP

Known issues with the image backup:

It doesn’t html decode the volume name correctly. E.g. /dev/vda1 as image to backup would be mangled to /dev/vda1. This is only a cosmetic issue unless the settings are saved again after setting /dev/vda1 as volume to backup for the first time.

Also using ALL/ALL_NONUSB doesn’t work (yet) as volumes to backup.