I'm using Backup Exec 2010 to backup roughly 400GB of data onto a 1TB hard drive. I do not understand how Backup Exec works (though, I'd love to learn), so this question may be rudimentary.
I have noticed that the HD had more than ample space to back up the required data at first, but more recently all my HDs have less than 50GB available.
Should I format the drives every so often, or does backup exec know what it is doing? I'm trying to avoid failed backups triggered by space requirement issue.