What does restore from backup mean on iTunes?

I always automatically backup my iPhone and it has the option there

Say your device gets stolen, you might want to restore your new device to get the content back

my daughters ipod touch has had to be reset to default twice and without a backup the content would be lost.

I don't rely on itunes backup

you need to store your media on another device like a pc

  • 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 does set up as new iphone and restore from backup mean? I have an ipod touch and I have many pictures, apps, and music on it. And now I have an iphone. I plugged my iphone in, and "Set up as new iphone or restore from the back up of" popped up. What happens if I set up as new iphone? What happens if I restore from back up? What do you suggest? I don't want to delete anything from my Ipod or my Iphone. I don't want apps, music, texts, or photos to be deleted. What should I do?
  • What does restoring my iphone from a backup mean? So I got an iphone 5s for Christmas 2013. So I decided to connect it with my computer on iTunes and when I plugged it in it says "Welcome to your new iphone 1: set up as new iphone 2; restore from my old back up which is my iPod. Which option should I pick because I don't know what restore from this back up means! Will option number 2 erase all my content and everything
  • What does restore backup mean? I just connected my iphone to my laptop and restored it and I noticed some videos from yesterday aren't there but I backed up my iphone a while before i restored it and I synced it there's an option and it is restore backup what does that do? Will I get the stuff on my camera roll back. And will I get my apps back?