If archive_mode is not configured, and i use snapshot solution for backup of the server, how can i ensure data consistency? Is there a way to quiesce all the connections to DB?
If your snapshot solution is atomic, then you are *probably* okay. I would do a few restores to test, but atomic snapshots give you a point in time and should be consistent.
Personally, I like archiving because it removes all of the maybes, but, that's me :)