backup by rsync 
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e.g. source = /media/sda5, destination = pc17

1.) login as user archiv
2.) mount /srv/archiv-WD300-DATA-Parts on pc17 to /media/archiv by running mnt-nfs-pc17-srv-archiv
3.) run rsync-sda5-pc17, which copies only changed or new files listed in file $srcs from dir /media/sda5 
    to destination on pc17 /media/archiv/sda5/$DATUM
4.) run umnt-nfs-pc17-srv-archiv to finish