Heres a handy suggestion -- plug the device in and look for a language folder that contains a lot of GTT files -- These are language files for the device should you want to switch to a different language every day you start the device up. You can either delete these GTT files (and leave the English/GB language file) or copy it over for safe keeping elsewhere.
Garmin will never re-download those language files unless you ask it to when your sync the device up with your phone or pc. deleting or removing the language files freed up 8mb of space for me and since my old 520 is very limited on storage capacity, the extra 8mb of free space allowed me to load a bigger chunk of map and more courses onto the device which your friend may or may not find handy depending on his usage/needs. I dont think the Edge 200 has a map feature but you can create a course with Garmin Express, Strava or RideWithGPS and it should follow a breadcrumb trail for navigation just like i do for my 520.
Eitherway, More space for more courses or more space for more ride logs (win, win situation)