I'm starting a a network of small wordpress sites, so what's better to use a vps or reseller hosting?
Depends, do you know anything about server administration? If not I say go with a quality reseller host. If you know your way around a server, than nothing beats the control you get out of a VPS. You aren't limited to what software you can run, as with a reseller, and you should get better performance out of a VPS considering you get allocated resources rather than having to share everything.
Yesterday i contacted hostgator and x10hosting regarding backingup and site restorations. This is how the story went. I think everybody should read this http://galaxiess2.blogspot.com/2012/05/how-did-this-all-start-i-will-narrate.html