Setting up a mirror raid
Advantages
			The data is saved on two hard drives and therefore there is always a 
			backup of the data. One hard drive crashes, you install a new one 
			and the data is still there.
			 
			Disadvantages
			Not portable. Corruption can destroy data on both drives.
			There are different methods to back up. Click on them for more 
			information.
- 
				Backing up files to an internal hard drive using backup software 
- 
				Backing up files to an external hard drive using backup software 
 Setting up a mirror raid
 
Here are other pages that may help you as well.
- 
				Information about backing up files in the event the computer crashes 
- 
				There is a limit to how many files can be on the root of a drive 
- 
				Verify the folder you copied and the folder you pasted the files to are identical in content 
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