I upgraded to JabRef 3.3 from JabRef 2.* about 2-3 weeks ago. Things were working fine until now. When I now try to save my databases it turns out that my /tmp directory (in Debian) has become 100% full (2 Gb?). In it are perhaps a hundred files of the form jabref3890608024893401806save.bib. The date of the files falls within the last 2-3 weeks.
When I use JabRef, I’m in the habit of saving frequently because in the past I sometimes loose data I just put in, and it is entirely possible the hundred saves are from the last few weeks. What is JabRef 3.3’s mechanism for disposing of dated backup files?