...following on from what Ken said about inventorying, I've set up automatic inventory jobs on all my sites. We use either 1/8 HP autoloaders, or MSL2024s. I set the job to run on a MOnday at 5PM, which is an hour before the start of the backup cycle.
That is possible, and if you ever need to run an inventory manually, you'd simply go into the Job MOnitor tab, right-click it, and choose Run Now.