What did you exactly backup ? is there anything on the backup tape that you could access ?
Regarding backup software for future. Two of the well know backup software company are CA (Computer associate) who have ArcServ and Veritas Backup Exec, these two software are very nice and work well how ever it have so many corks and bell /whistles that would not be suitable for small business

plus they cost and arm and a leg (including first born).
I would suggest to get a external USB 2.0 drive (as big as you can get, perhaps 160 Gig) , they run around $300 and you can take it home with you every night for safety reason. You wouldn't need a third party software to operate that.
cheers