People use both methods, either make a back up through the menus on your box to a usb stick.
Or just use filezilla and back up your line details.
I just keep a copy of my line details on the desktop of my PC.
So as mentioned above you just need a copy of
CCcam.cfg
or a copy of
Newcamd.list plus mg_cfg
the files can be found in USR/Keys for OpenATV images.