Is there any way to fiddle with how much space this is allowed to consume on your hard drive? I recently ended up hosting a foreign iPhoto library on my laptop so someone could show a slideshow during a presentation, deleted it, and the space wasn't recovered because it had been committed to Local Snapshots before I could do so. That started a snowball that ended with approximately 40GB of my hard drive space consumed on backups, mostly files that I didn't want backed up whatsoever. Is there some plist file somewhere that I can tweak to lower the threshold to 10/15/20 GB or maybe even less? I do website design and graphics work, so the quick local backups ARE useful, but not if they're going to eat into my hard drive so heavily.