In this part I'll give pointer on how to install some version of Linux onto a USB flash drive.
The idea is to be able to boot off the drive and run the backups from there. The set up must have "persistence" i.e. you need to be able to save files to the drive. Not every set up of Linux supports this - some of the Live USB versions are read-only. I use PuppyLinux because it's easy to set up and has quite a pleasant UI. There are many alternatives but most require quite a bit of effort to get working.
Get a smallish USB stick and follow the installation instructions over here.
In the next part, I'll detail how to write the backup script.
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