I just finished optifying the following folders:
/usr/lib/locale
/usr/share

i have these folders now as links to a path in my opt partition and i have 45mb! of free space of root now

The device boots normally, however, in the multiboot menu when i try to run backupmenu, i get a black screen and it just reboots again.

how can i override this?

[Edit]
it seems that /usr/share caused another issue with the device's sound - it stopped working so i returned this folder to be root. i'm not sure what was the reason for this behavior, but now all is back to normal (30mb available).