Take backup at lowest possible (non-idle) CPU priority, and idle I/O priority.

[backup.sh] / README

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 You need hardware:
 x a computer running a free unix clone.
-x as much disc as you can aford.
+x as much discspace as you can aford.
   
-You need software:
-x ssh (or perhaps openssh)
+You need software on clients and server:
+x ssh/openssh
 x GNU bash
 x GNU tar 
 x GNU shellutils
 
 How to prepare your computer:
-x mount your huge partition (we use /backup)
+x mount your huge partition (we use /backup).
 x make it possible for ssh to log in from this computer
   to your other computers as root without a password. scary.
 x put this software in a directory (we use /home/backup/)
+x put the name of your computers in /home/backup/conf/computers.unix
+x the fifth field (of the partitions you want to back up) in
+  /etc/fstab on your clients should be >0 
 
 Crontab entry:
 We use cron to start the script every night. Here is the entry we use: