There are many, many different ways to back up your Ubuntu system. Here were going to look at two of them, one of which is a full system backup and the other is a way to copy folders and files.
Enjoy it at arsgeek
All of my backups are done to an external drive. In my case, this is a firewire drive that is mounted in my /media directory. Theres nothing stoping you form doing this to a network drive, a seperate partition or even your primary partition. However, you do have to be cautious of your space limitations. Backing up a 3 GB install onto a 40 GB disk is fine, but backing up 63GB of data to your 80GB drive not so good. This is one of the two reasons I use an external 200 GB drive. Lots of space. The other reason is that moving a backup file off of my primary partition after Im done backing it up just seems like an extra step.