Failed Backup

We use Comodo Backup 4.1.1 and backup our laptop to a Worldbook and it works nicely. Now trying to backup a smaller external drive mapped to my laptop, to the Worldbook. We are able to select files as desired and the backup starts and runs nicely until it gets to 99% every time. Then it gets Reconnection failed errors over and over. Any ideas?

This problem was related to a disk space issue on the Worldbook, we figured it out ourselves. Sorry to both everyone, but thank you anyway~!