Is there a way to delete snapshots?
On Mac OS X, hold down the Option key when you choose one of the snapshots. It will be revealed in the Finder. You can then delete it, rename it, copy it, etc.
On Windows, hold down the Shift key when you choose one of the snapshots. It will be revealed in Windows Explorer. You can then delete it, rename it, copy it, etc.
HTH,
-Kirk