I just saw that Reflect Media Group has released another add-on for XMod Pro. This one is a utility that most sites need - deleting files that no longer have a corresponding record in the DB.  Here's their description:

"With OrphanX you can create cleanup jobs for your website. What happens when someone uploads a file but the record gets deleted? You end up with orphaned files and over time your file system gets bloated. Run in safe mode to compare files to keep vs. files to delete prior to performing permanent deletion."

Read More About It Here