Hi. Running dCore-jessie.15.12.16, default terminal backup, line break between 'Backing up...' and 'Done' would be more readable.
tc@box:/mnt/sdb1/dCore/boot$ backup
Backup device is set to: sdb4/tce
Perform backup now? (y/N) y
Backing up files to /mnt/sdb4/tce/mydata.tgzDone.