If i update my iphone 4 on new computer can i restore it after from a backup?

I originally synced my dads iphone (business phone) with my macbook pro and we now have an imac and i need to update the phone on this computer (iMac) to ios 6. I did the backup and then i clicked update but it said "it will erase all data when you update'. If i click continue after the update can i restore the phone from the backup? If so how do i do this? It is crucial that i do this right because i can't loose my dads business info and contacts.

Nah I own a flip phone

Yes, you can update it and then restore from the backup to get all your data back.

  • Will my ios downgrade if i restore backup via a computer with an iphone? The last backup i did for my iphone was about a week ago just before ios7 came out via a computer. If i download ios7 now and then do a restore via a computer will my iphone go back to ios6 since that is the ios that was on the phone when i backed it up?
  • When you restore an iphone from itunes backup does it restore messages? I need to restore my iPhone 4S in iTunes, will I lose my messages or will it leave the messages from my most recent back up?
  • What happens if you restore from backup after jailbreak on an IPhone 5? I just jail broke my iPhone 5 and I rememeber that after I updated to iOS 7 I restored from my backup to redownload all my apps so what happens if I do that after I jailbreak? Will the jailbreak come out?
  • Restore iPhone backup from different computer? I should be getting the iPhone 5 today at work. My current iPhone is on Mac and at work we used windows. We do not have Wi-Fi at work but I would like to restore and start to use the iPhone 5. What I was thinking of doing is backing my iPhone in iTunes and putting on a portable drive and restore it on an windows based iTunes. Will this work? I don't want to convert the iPhone to windows. I'm really just trying to figure a way to start using the new iPhone.