Is it this:
http://www.cypherix.com/cryptainerle/
If so, I would never, ever use it.
All security products that encrypt data should be open source. If not, then unless you know and personally trust the people that make it, you cannot trust the product. Thus, you shouldn't use it.
Rojash is correct though -- while a backup is good, and it's a good job you did it this time, it really does defeat the object of using encryption in the first place, unless you store the backup in a place with as good or better security than the data you lost.
If you still want to do this -- and it's a good idea to -- then use TrueCrypt. Free software (and thus open source), tried and tested, including by many security experts in the industry.
http://www.truecrypt.org/