.bakfiles while working.
.savis the automatic backup feature: Each 15 seconds, the current state of the library is saved.
.bakpreserves the last state of the library after saving. Thus, one can go back one save command in the history.
.sav, JabRef offers automatic saving of the library. No need to click on File --> Save or pressing Ctrl+S anymore: The opened database are saved automatically without manual intervention.
.bibfile should automatically be saved on each change, you can direct JabRef to do so. This feature needs to be activated in the preferences:
.bib.savfile) and keeps that up-to-date on every user interaction. For instance, when you change a field the new value would get saved into the backup copy. Assuming that JabRef crashes while you are working on a BibTeX database. When you try again to open the file JabRef crashed with you will get the following dialog:
.savfile will be removed. Otherwise, this file is going to be used for database restoration next time.
.bakfile preserves the last state of the library before saving. Thus, one can go back one save command in the history. For more advanced history, we recommend to use git as version control system.