Great article! It describes all the things you need to know to get started with snapshots.

I have a question though. Do I understand correctly that a snapshot will cause a LOT of overhead if you leave it running for days or, perhaps, weeks? I tend to use snapshots only in particular situations in which you exactly know what you want to do/find out.

Forgive me, I'm just trying to figure out when you can use snapshots best. for now, I think it might be useful in some situations. Especially for ad hoc reporting, problem solving, debugging and restoring a database after a dba or developer tested some small changes.