Here is an excerpt from an article that provides a brief introduction cloud backup services: "Backing up data on your computer has always been critical. A long time ago floppies were used to backup your data, later it was CDs and then DVDs. Today there is no affordable external removable media capable of keeping up with modern multi-terabyte drives.
Even if you have an external drive or NAS (network
attached storage), it can be damaged, lost, stolen or suffer data
corruption. If you don't have an off-site backup, and your local backups
are in-tact they can be damaged by fire, earthquake, or other
natural disasters." (read the rest of the article)