You can store a backup copy of site.
third party
using floppy diskettes
A good plan for backing up data is to setup an automatic backup to an external drive or cloud based storage on a regular basis. This will ensure that no data is lost and can easily be recovered.
It is important to back up data because computers are extremely sensitive. It is only a machine. The slightest of power changes, or a virus can cause your computer to freeze or crash. All of the hard work you have done and all of your personal information can be lost. It can not be emphasized enough the importance of backing up your data not only frequently as you create it, but regularly to prevent a catastrophic loss.
maintenance
Backing up your iOS device basically putts all your data From your iOS device on your computer. This is great when you want to migrate data from 1 old iOS device to a new one.
so you dont lose it......... . . . .
wipe the hard drive
modem
backing up data
Backing up.
It means it's backing up all of your songs , apps and photos while syncing.. That why if you delete anything you'll have all of your data on iTunes