To specify a destination volume:
All the data stored on the target volume will be replaced by the backed up data, so be careful and watch out for non-backed-up data that you might need.
When using bootable media
Disk letters seen under Windows-style bootable media might differ from the way Windows identifies drives. For example, the D: drive in the rescue utility might correspond to the E: drive in Windows.
Be careful! To be on the safe side, it is advisable to assign unique names to the volumes.
The Linux-style bootable media shows local disks and volumes as unmounted (sda1, sda2…).