>> Complaints about slow backup times......

>> It's a AthlonXP 1600, 512MB Ram.
>> Both disks are Samsung Spinpoint. 
>> hda: SAMSUNG HD400LD, ATA DISK drive
>> hdb: SAMSUNG HD300LD, ATA DISK drive

The problem is likely your disk configuration on your backup host.

1) Don't use master/slave on a single IDE controller (which typically shows
as hda and hdb).
   Use each drive as a master on its own IDE controller (one disk per
cable).  Buy another IDE
   controller card if you have to.  Your CDROM should also be separate from
the disks.

2) Use hdparm to tune your disks. Make sure DMA is on and the unmask IRQ
flag is on.

Other thoughts:
   Use rsync on your localhost instead of tar
   Don't run X on your server during backups - it just takes away memory
that could be used for cache.





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