In theory: Yes.
There's no way of telling how it will actually work with corruption issues and all.
Here's how to backup your user data: http://sims4.crinrict.com/en/2014/09/backups/
Here's instructions how to backup your installation files so you don't have to re-download: http://help.ea.com/en/article/backing-up-and-restoring-your-origin-games/
According to the first link you gave me.
http://sims4.crinrict.com/en/2014/09/backups/
I just copy "C:\Users\#USERNAME#\Documents\Electronic Arts\Sims 4".
The next link, is exactly same but with "C:\Program FIles (x86)\Origin Games\Sims 4".
So, if I copy these, then I'm technically safe?
@edit - Your signature. "Please accept a solution if your issue is solved. XP is also appreciated", I know how to accept answer, there's button right there, but how do I give someone XP?
By clicking on the white XP button next to the blue box on the post that helped you.
To keep your Sims, the user files are most important (link to my blog). So just copy the folder in documents and then just put it back after reinstalling.
The installation files is just to save time and to not have to download the whole 9 GB again. If you like to install from disc, that doesn't apply to you.
