This might help in the future in case you setup a remote mount for backups in the future. Look into using systemd’s automount feature. If the mount suddenly fails then it will instead create an unwritable directory in its place. This prevents your rsync from erroneously writing data to your root partition instead.
I think there is a value you can put into a /sys file to fix this. Had the same issue on my k10 keyboard. (the fix was easily findable on their forums)