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Customizing Ubuntu to run from RAM only, within GRUB options

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http://askubuntu.com – I'm interested in exactly this up, now let me explain what would like to do with this. I'm preparing to buy 32GB of RAM and already have Quad Core. My idea is to implement another option in GRUB that will do exactly this: On boot move whole /root partition to ramfs, and boot ubuntu from there From time to time and also at shutdown signal, run rsync to "backup" data to HDD, of course in background. I already have SSD, and I think that rsync wouldn't take much to sync files. And also, loss of data is less important, except if it would be loss of more than 30 minutes active work, Because upti (HowTos)