Software the "jailbreaking guys" use to backup and restore different customer phones

[sdruid]

I have seen these guys backing up and restoring phones from different customers on their PC computers, and I am curious as to what software they are using to accomplish this because I would like to be able to keep multiple backup sets of my own phone that I could go back to.
I tried asking one guy who did a jailbreak on my phone about 6 months ago or so and he wouldn't tell me what I wanted to know but instead referred me to itunes.
If anyone here knows what software is being used and where to get it from - I would greatly appreciate the information.