GUI is showing image backup of linux

Server
1

Strange behaviour: I have a laptop with dual boot: Linux Mint 18.2 and Windows 10. Today I started Linux and after some time shut the laptop down and started W10. Now an image backup is running. The GUI of UrBackup is showing that both systems (Linux and W10) are online and the Linux system is running a image backup (Volume C:).
Strange because:

  • Linux is not running
  • image backup of a Linux system should not be possible
2

The image backup is now finished. So now the partition should have been backuped two times.
1// as W10 partition
2// as Linux partition
But the “Storage Usage” in the GUI shows an increase of storage.

Shouldn’t deduplication prevent this? Backing up the same file twice should use disk space only once (+ a small amount for meta data)?