Ways to store backups
You can back up files to any of the following storage types:
These options are known collectively as media. You can also use an Internet-based file storage service. To decide which option to use, compare convenience, price, and ease of use, and consider the amount and size of files that you want to back up.
Keep backups in a safe location
Always keep removable storage or media used for backups (such as external hard disks, DVDs, or CDs) in a secure place to prevent unauthorized people from having access to your files.
Internal hard disks. You can install (or have someone else install) a second internal hard disk in your computer and use it to back up files. Hard disks are relatively inexpensive and are not affected if you have a problem with your operating system. You can even install the disk in another computer if you buy a new computer and you still want to use the disk for backups.
Note: Never back up files to a location on the same hard disk that Windows is installed on because if your computer gets a virus or has a software failure, you might have to reformat the disk and reinstall Windows to recover from the problem.
External hard disks. If your computer has a USB port, you can attach an external hard disk to it and then back up files to the external disk. Be sure to buy an external hard disk that has plenty of space for your backups (200 GB is a good choice). For maximum protection, keep your external hard disk in a fireproof location separate from the computer.
You can also save your files to DVDs or CDs. Make sure the discs are writeable, which means that you can add, delete, or change the content. If you decide to use this method and have a lot of files to back up, be sure you have enough discs to finish the job. The Back Up Files wizard tells you how much space you need each time you perform a backup and recommends the type of media to use. If you label the discs with the date and time of the backup, they will be easier to find later. For maximum protection, keep the discs in a fireproof location separate from your computer.
Note: This information provided by Microsoft.