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 crahes, 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.
Here are other pages that may help you as well.
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Information about moving a program to another computer
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Information about backing up files in the event the computer crashes
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There is a limit to how many files can be on the root of a drive
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When you are copying the contents of one folder to another, it may appear to be a success. However there are times that some files do not get copied over and if you don't verify the folder, you may loose some files. Click here for instructions on verifying the folder you copied and the folder you pasted the files to match.