10.2 GB to be exact, which stands for 11.003.011.062 bytes. (or 11,003,011,062 bytes for the US dudes out there)
7.050 files of game types, maps, textures, mods etc.
Next target: 10.000 files. :p
Now it's time to make a backup.
edit: image added:
Edit2:
Whoops! I made a mistake with the cache size: I still had a big RAR file in there, which makes the size incorrect. The current size of the cache folder is 7.79 gigabyte, so I did not reach the 10 GB yet. (!)