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This might not be what you need exactly but it can also be considered as a backup than can directly be used on other computer. After setting up my development environment and after I compiled many packages by hand, I wanted to have a portable version of my Ubuntu that I can run directly on any other computer just by plugging my external hard drive and booting from it, continuing working on my packages as if nothing changed. For that I just used DD to clone my current Ubuntu Partition to a partition in my external hard drive.

dd : http://how-to.linuxcareer.com/learning-linux-commands-dd

But one important thing: BE CAREFUL, read the tutorial again and again, if you switch the source hard drive and target hard drive, you will loose all your data.

This might not be what you need exactly but it can also be considered as a backup than that can directly be used on other computer. After setting up my development environment and after I compiled many packages by hand, I wanted to have a portable version of my Ubuntu that I can run directly on any other computer just by plugging my external hard drive and booting from it, continuing working on my packages as if nothing changed. For that I just used DD to clone my current Ubuntu Partition to a partition in my external hard drive.

dd : http://how-to.linuxcareer.com/learning-linux-commands-dd

But one important thing: BE CAREFUL, read the tutorial again and again, if you switch the source hard drive and target hard drive, you will loose lose all your data.