On 11.08.2015, Diogene Laerce wrote: 

> Is there a trick I don't see here ? Because if the backup of those
> directories is enough for a full restoration of a system state, this method 
> is far more
> efficient than the others, isn't it ?

If you backup all your partitions with rsync, all you have to do in an
emergency case is to boot from e.g. CD or a memory stick [1] and
reverse the rsync command.

Example:

rsync -avxHSAX /home/ /backup/home   --> backup
rsync -avxHSAX --delete /backup/home/ /home   --> restore

The "--delete" parameter will take care of all the files that are not
in the same state as when they were saved.

So in case of a complete disaster, just restore your data as
described. If your boot sector is damaged, you'll however have to
restore it by hand (which isn't all too difficult).

[1] http://www.sysresccd.org

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