I just did a fresh install of centos and spent ages adding all my standard libraries. Is there a way I can easily take a copy of this build and deploy to another new server?
You can use any disk cloning tool like clonezilla. It supports many file systems including ext3 and ext4 (the most common in Linux environment).
from the machine you want to copy to (boot from a live disk or network boot, format the hdds, and mount them somewhere. cd to that location (root of the hdd to be copied)) then run the following (copies everything perfectly over and securely)
This will take quite a while (depending on network speeds). Now all that is left is installing your bootloader (if you're using grub, simply grub-install /dev/yourhdd_andPartition
reboot (and if you installed your bootloader correctly), everything should boot up and be exactly the same as your previous machine.
EDIT: Breakdown of that command: