You may want to encrypt you osmo directory using encfs (try cryptkeeper) or place it in an encrypted container (try LUKS/dm-crypt) - gnome-disk-utility is a good frontend. Or just encrypt your whole drive using LUKS. Lock your screen when you're away.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
You may want to encrypt you osmo directory using encfs (try cryptkeeper) or place it in an encrypted container (try LUKS/dm-crypt) - gnome-disk-utility is a good frontend. Or just encrypt your whole drive using LUKS. Lock your screen when you're away.