The security cameras with hard disk storage are the best. You can review it daily and it has a time stamp. I'll guarantee they case you much more often then they actually rob you. They go "shopping" before they actually take stuff. Seeing any activity at all would at least put you on to their schedule. Although I would guess between 2:30 and 4:30 am anyway. Too much activity before the bars close for most thieves. You can also try security system signs. They are less likely to frack with stuff if you have them prominently posted. BTW, you don't have to get a security system, the signs are a better deterrent than having an actual system.