Hi im currently on 2.0 but not unlocked or hacktivated since im on official carrier, if i want to have a custom firmware, can anyone tell me what will be deleted from my phone and if and how will i get my settings, sms, springboard replacement back to how it is now. I have made numerous backups of my phone would i be abel to restore the newest backup i have created and will everything be on my phone as it is now, apart from the music.

I have an official contract too, restored with a pwned firmware.
Settings are restored from the latest backup, you have to resync your media.
I remember that i had to reset my time zone manually , was Cupertino after restore.
SMS, contacts, calendar,mail (after 1st update) were intact, cant remember stocks,youtube, maps because i dont care.