Question Git extension: can't clone website

[Troner]

Hello,

I have setup the Git extension for Plesk and I can push things to the master. In my case /var/www/vhosts/DOMAIN/httpdocs
I'm trying to clone the repo to work offline with, but my website was there before I installed the git extension.
I can only clone files if I pushed them already.
I tried downloading all files and then push them to my server but my website is too large (>1GB), git says 413.
Can't I just define the current httpdocs folder with all files and directories as repo?

Happy Easter!