I used UNIX SCO 16 years ago.
At other unix option -m count in MB
you can use -k it's print count in KB
do "man du"
My proposion is for count how many place used in directory and all files in
Option "-name ./xxxxx -prune" means print name files(and directory) without (exclude) all in directory ./xxxxxx
I wants that you find directory example /usr 1000M /xxxx 500M
in your filesystem "/" without /usr /xxxxx is 1000M, you can archive it in file less then 2GB.

it's a problem with you system
file core is file with information about problems with programs.
when you move your server it's no nessesery to copy.
Please "rm core".
My proposition do:

Code:

cd / ; find ./ -name core -print -exec rm {} \;

change name directory if it nesesery.
if you don't undestand please send output;

Code:

cd /; du -ks *

PLEASE DO THE CODE.
change name directory if it nesesery.

Code:

scounix# mount -f NFS 192.168.1.246:nfs /mnt
scounix# cd / ; find ./ -print -name ./home -prune -name ./usr -prune -xdev| cpio -ovfB > /mnt/backupfile.cpio &
scounix# cd / ; find ./xxxx -print -xdev | cpio -ovfB > /mnt/backupfile_xxxx.cpio &
scounix# cd / ; find ./usr -print -xdev| cpio -ovfB > /mnt/backupfile_usr.cpio &

if you haven't free space you can do backup.....cpio by one in the order.
And you can on target system do:

Code:

cpio -ivdmlu < /mnt/backupfile.cpio &
cpio -ivdmlu < /mnt/backupfile_xxxx.cpio &
cpio -ivdmlu < /mnt/backupfile_usr.cpio &

other filesystems you can transfer the method or start new SCO and transfer next filesystems by ...nfs...ftp...rcp....
you can see man find and man cpio at system SCO.