You can email many file types (depending on the app) to your computer, and you can also export many when syncing with iTunes.
you have to go to you device and the tab that says applications from there all you have to do is unclick the check box that says sync.
Search Google, and download Sharepod or iDump. These are free and will transfer music from an iPod to a computer.
Syncing photos allows you to view pix you've chosen on your computer on you iPod.
No, it won't, unless you are syncing from a different computer, then yes it will.
Yes, in the same way you get music on your iPod - simply import or download songs into iTunes and connect your iPhone to the computer and it will, unless otherwise specified, begin syncing between your iPhone and your computer.
For syncing data to a computer.
why yes in deed it can happen to my friend
syncing
In order to put music on an iPod, first put the music into your computer's iTunes (download this if necessary). Once the music is in the iTunes, syncing the iPod should put the music in.
sync it with itunes on your computer....BEWARE: syncing will delete all the songs and videos and everything from your ipod
If the app was free you can just down load it again from the app store If it was a paid app it should download on to your i device after syncing to your computer However if you are pc free you might not be able to download it again