The reason snapshots are so fast is that they're only tracking changes pages. It's not an actual backup. It completely dependent on your original database being in place. As Gail has noted, they're not a part of a DR scenario.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning