Copying files to an internal hard drive
Advantages
The drive can be large enough to copy the files to the drive. You
see the files that you have saved so you know which files were
saved. The files are always accessible.
Disadvantages
It is not portable. If you do a reinstall of your data on your main
drive and don't disconnect the backup drive before hand, you might
accidentally touch the data on the backup drive also. To protect
yourself from that happening, you have to open the case and
disconnect it. Since you are manually selecting the files, you can
overlook a file. This can also be time consuming. As long as the
drive is connected, the drive can be infected by spyware or viruses.
There are different methods to back up. Click on them for more information.
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Backing up files to an internal hard drive using backup software
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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