The docs say this module isn't listed because it's always included. But testparm doesn't show it and "previous versions" aren't showing either. Any idea what's up?

I'd like to create a snapshot routine that looks something like this, and export it via shadow-copy ("Previous Versions") on CIFS:: Every 30 minutes, kept for 72 hours Every 12 hours, kept for 21 days Weekly, kept for 6 months Offline or further snapshots for 1-3 years or as needed, or backups...