i was wondering why one of my server told me his 100 % rootfs. It is a very light installation of ubuntu server.
So i researched the reason and found Btsync as the bad guy. I have 2 other btsync installation and found the same symptom there.
The /var/lib/btsync is messing up the rootfs and i got more than 10g there! Why? That's not common in linux to mess up the rootfs with a small programm.
I found it on my raspberry as well. There was more than 2,4g antoher installation had 8,5g occupied space by BTsync.
So why there are such big db files saved in /var/lib/btsyn