Offline cache files are taking up too much space.

When I drag a file (insert a copy into the page) to onenote, it automatically saves a copy of it inside the offlinecachefiles.

Aside from saving the files inside the main Notebook files (.one)
and
Saving it again (twice) for backups.
That means i have 4 copies of every files i saved on onenote.

My question:
-Can I turn off offlinecachefiles?
(I don't use sharing, sync, live, network, etc.. 1 user admin)

Thanks