Hi Darryl,
I have thought about this one also.
I continue to perform folder level backups to private and public stores, but I use the Backup to disk as media instead of tape - that way the library is relieved of work it could be doing on other stuff.
The BTDF is local on the server becuase if there was a failure that required the server being rebuilt / restored, then I would recover exchange from the IS tape backup not the folder level backup anyway.
I'm not so sure the recover deleted items handles all items - i.e contacts calendar etc?
I find it reassuring to know I have a BTDF of the exchange folders, but if any set had to be dropped - this would be the first.
Thanks,
Niall.