[Borgbackup] not running borg as root

[Thomas Waldmann]

> Alternatively, make 2 backups:
> 
> - hostname-system-timestamp with all except home (also exclude /proc /sys)
> - hostname-home-timestamp with just your home(s)

The point of that is to have 2 different prune policies:

- get rid of the system backups rather quickly
- keep the home backups for a long time


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