I am having problems with a couple of large accounts. I remembered I had this problem last time I moved some big ones. Account copy feature works great except for very large accounts.... 5 GB and more seem to time out. I am trying it again now.
I found this from an old post I made a wile back.... it works and it works well as far as I know.
This may help
For large sites, the Cpanel move feature via WHM will timeout due to the large .tar.gz file it generates. To do it manually you will have to use SSH as the root user. The following commands should help you:
First on the server that the account is on now, use the following command to package the account:
/scripts/pkgacct USERNAME
Change USERNAME to the username that you want packaged. This will save all the user files, email accounts, MySQL databases etc. into one .tar.gz file. This process make take some time depending on how big the site is.
The file generated from the command above will be locate at:
/home/cpmove-USERNAME.tar.gz
You now have to move this file so that it can be accessed via a web address. Usually this can be moved to /usr/local/apache/htdocs which is the default http directory on Cpanel servers. Again, this can be done by using this command:
mv /home/cpmove-USERNAME.tar.gz /usr/local/apache/htdocs
Change the chmod permission of the file so that you can download it via the web:
chmod 644 /usr/local/apache/htdocs/cpmove-USERNAME.tar.gz
Next... go to your new server and login via SSH as root. First change to the home directory:
cd /home
Now get the file from the old server:
wget
http://SERVER_IP/cpmove-USERNAME.tar.gz
The URL above usually works, but you can change this to a domain name depending on where you have placed the .tar.gz file on the old server.
And finally, restore the Cpanel package:
/scripts/restorepkg USERNAME
Remember to delete the cpmove-USERNAME.tar.gz from your old server to prevent other people from downloading it aswell. the restore process will create the Cpanel account on the new server and restore all the files and settings for that user