Backup your Ipod (usually does automatically), and sync.
Regularly make a backup of your iPod. If all the iTunes library information is gone, you won't be able to sync your iPod, but if you keep a backup of your iPod music, you just need to retrieve the backup and then you have all your music back.To discover some applications that can do this, take a look to the links section.
From your old computer, go to the 'File' menu on iTunes, go to 'Library', then 'Back up library'. Copy the backup, open with iTunes on the new computer, and it should be there.
If your hard drive crashes, you lose your itunes movie library. There are two types of hard drives, those that have crashed and those that have not yet crashed. A number of places sell external backup drives.
you cant unless it was a library with an account
Yes. Windows version of itunes will recognize the soundfiles in your mac iTunes library.
itunes error 13010 refers to a corrupt itunes library genius file -- to resolve it remove the "itunes library genius.itdb" from your itunes folder and relaunch iTunes
No.
A new version of iTunes only updates the iTunes software and does not touch your music/movies library.
it means that it will save that music to a folder on your itunes library.
Updating iTunes only updates the iTunes software it will not touch your music library.
An iTunes library is all the music an your computer, and on you iPod is stored. Just like a library of books, a library of songs, movies, and pictures.