Backup across LAN using tar

[Jeff CTR Vandenbussche tc faa gov (Jeff CTR Vandenbussche)]

     I know this is slightly off topic.  Is there any way to use tar to 
     backup another system on a network.  I want to use tar (or any other 
     method) to backup my Linux boxes (that have no means of backup) onto 
     the 8mm tape drive on my RS/6000.  Does anyone know of a way to do 
     this.
     
     Thanks,
     
     Jeff