User-Agent: Mozilla/5.0 (X11; U; Linux i686; ru; rv:126.96.36.199pre) Gecko/20101114 Ant.com Toolbar 2.0.1 ALTLinux/Sisyphus/3.6.13-alt1.20101110 Firefox/3.6.12 Build Identifier: In Sunbird profile dir there's the backupData folder containing calendar files backups. Migrating to TB+Lightning has lost this functionality. Reproducible: Always
Behavior is identical for Sunbird and Lightning but changed a little in recent versions. Backups are only created for ics calendars - same behavior as before. But files can now be found in <profile>\calendar-data\backup.
Changed behavior explained in comment#1.