how to speed up backup / increase load over 3

maybe uncommon question but how do i speedup backup

currently i made already seetings

extracpus = 16

but somehow load wont go much over 4 and backup is very slow - 300GB need 12 hours

is there any other way to increase spped?

running cPanel 11.25.0-R44675 - WHM 11.25.0 - X 3.9
CENTOS 5.5 i686 standard

Intel(R) Core(TM) i7 CPU 975 @ 3.33GHz

which shows 8 cores

so load @ 8 would be just fine

( i just tried 16 to max out server performance but wont work )

thx in advance
cheers
zye

/scripts/cpbackup
root 5999 0.0 0.0 1656 392 ? SN 22:23 0:00 \_ /usr/local/cpanel/bin/cpuwatch 16.0 /scripts/pkgacct username /home/cpbackuptmp/cpbackup/daily backup
root 6000 0.0 0.0 17188 12428 ? SNs 22:23 0:00 \_ pkgacct - username - av: 3
root 6060 0.0 0.0 17188 10816 ? SN 22:23 0:00 \_ pkgacct - username - av: 3
username 6061 0.3 0.0 13624 7652 ? DN 22:23 0:09 \_ /bin/gtar -c -f - -X /home/username/cpbackup-exclude.conf -X /etc/cpbackup-exclude.conf .

load average: 2.98, 2.86, 2.48

 

maybe its the pkgacct - username - av: 3

av: 3 - limiting load to 3 ?

where can i change this ?

cheers
zye


/scripts/cpbackup
root 5147 0.0 0.0 1656 392 ? SN 10:10 0:00 \_ /usr/local/cpanel/bin/cpuwatch 15.0 /scripts/pkgacct username /home/cpbackuptmp/cpbackup/daily backup
root 5148 0.0 0.0 14268 12332 ? SNs 10:10 0:00 \_ pkgacct - username - av: 3
root 5295 0.0 0.0 14268 10784 ? SN 10:10 0:00 \_ pkgacct - username - av: 3
username 5296 0.5 0.0 3056 1440 ? DN 10:10 0:05 \_ /bin/gtar -c -f - -X /home/silzbull/cpbackup-exclude.conf -X /etc/cpbackup-exclude.conf .