Anymore I flash probably twice per day at a minimum. The following are what I backup
1. Contacts
2. sms messages
I use pimbackup to back up those. The rest I keep in my storage card, or reference I actually cook it into my rom. I guess it's an advantage when you are your own chef. But documents, music, etc are all kept on the storage card. User customization is a great way to install .cabs, and UC xml: is great for registry entries and setting up e-mail. I have evolved to my flashing habits. I probably wouldn't recommend one of device-backup software programs if you flash often. Those are made for people that don't know about
www.ppcgeeks.com.