"The first, and most important, is that the backup medium is not
located on the same drive as your Linux setup. I personally use an
external USB drive for all my backup data (which can be purchased
for next to nothing nowadays), although you could use another
remote drive within your system unit, even a non bootable drive.
These techniques are based on my favorite flavor Ubuntu and can be
applied to any version of GNU/Linux.
"The easiest method would be to use a simple "tar" command (such