Guild Wars 2

Is it possible to uninstall the client in such a way that when I reinstall it, it wont take forever to redownload all the background stuff?

There is not really much to uninstall .. in the end you just need to delete the
files and the shortcut.
The biggest file is the gw2.dat so if you delete it you will of course have to
download it again .. however if it is not to save the space then i don’t know
why you want to delete it at all.

So your special uninstall would maybe be to just delete the shortcut from
your Desktop

As Beldin points out, the GW2.dat is the file that holds all of GW2’s data. So if you don’t want to reinstall the entire game later then make a copy of that file (probably around 20GB) so that you can copy it back later.

Unless you have a USB or external hard drive to put the dat on then there isn’t much point uninstalling. Deleting everything other than the dat file will only save you a few mb’s.