RE: back up scope.?
Ok - Here's my $.02.
BSA .... not no, but heck no !!! My experience with this brand granted is very limited (2 scopes). Both were the so called "Night Owl" line and both were beyond pitiful in low light and about as clear as a Mason jar. I donated them to Goodwill.
If you have to stay economy, look at a Bushnell Banner. If you can send $250-$300 or so, go to the Leupold Vari-X II, Bausch-Lomb Elite 3200 or something like that.