Initial revision

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+You need hardware:
+x a computer running a free unix clone.
+x as much disc as you can aford.
+  
+You need software:
+x ssh (or perhaps openssh)
+x GNU bash
+x GNU tar 
+x GNU shellutils
+
+How to prepare your computer:
+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/)
+
+Crontab entry:
+We use cron to start the script every night. Here is the entry we use:
+2 2 * * * /home/backup/backup.sh < /dev/null >> `/home/backup/logfilename.sh` 2>&1