copying complete/old centos drive to ubuntu -- how!

[bruce]

Hi

Got an old centos system. Its got a bunch of "stuff" I'm looking to
copy a bunch of the stuff to the new ubuntu system.

At the same time, given that the old centos drive is the 2" laptop
internal, I'm thinking of getting an eternal/usb caddy/device that I
can simply attach to the usb, or have it attached/usb to one of the
other systems, and access it via wifi.

Im really looking at keeping the same users/processes/etc.

So, let me have thoughts/comments.