He does not mean away from the computer :p But to make sure you have an up to dat copy of your important data, a weekly backup to a memory stick can literally save your digital life.

An external hard drive connected permanently with a scheduled back up WITH a separate backup to a memory stick is even better, a permanently connected external hard drives “could” get infected at the same time your computer does, So the memory stick is like a failsafe.

Please everyone, make sure you have a least 1 up to date backup ( more is better xD )