Mintbackup request. Select destination, duplicity backend

[galen]

Here are some improvements that will make Mintbackup much more effective.
MB stores the backup in the same partition that is the source, this means the user will need about 40% disk free. This is a limit.

I suggest that MB:

• allows inputing of a destination partition / mount point
  
  backend using duplicity (backup to web/ftp site), and the inputing of a destination site (username:password)
  
  slice size