GeoGebra Classic 6 - impossible save of my work, no local backups
I work with Geogebra 6, after whole day of work I can't find changes I made in my file.
There are no local backups, no trace on my account, even if I made multiple saves.
I am using Ubuntu 16.04 LTS, 64-bit.
Why did I lose my work? Why is there no automatic backups locally?