(In reply to comment #0)
> 
> Current behavior: All is lost forever including any backup files.

Where do you get backup files? I could only create a backup-file, when I copy the database-file and insert it on another place. This could be made also by a macro.
> 
> Expected behavior: A Back-up file is created which is not deleted and can be
> used to recover an accidentally deleted Database or Table.

This is a new feature you wish. It could be a good idea to minimize dataloss. So I set the importance to high and enhancement. The problem isn't only a problem of a specific platform and exists also in the versions of OOo before LO has been created. So I also change Version and platform.

Not a solution for every case, but a way: The following macro will create up to 5 backups in the backup-folder of LO and then will delete the oldest backup. It should be linked to the opening of the database-document:
-----------------------------
SUB Datenbankbackup
	DIM oPath AS OBJECT
	DIM oDoc AS OBJECT
	DIM sTitel AS STRING
	DIM sUrl_Ziel AS STRING
	DIM sUrl_Start AS STRING
	DIM i AS INTEGER
	DIM k AS INTEGER
	oDoc = ThisComponent
	sTitel = oDoc.Title
	sUrl_Start = oDoc.URL
	oPath = createUnoService("com.sun.star.util.PathSettings")
	FOR i = 1 TO 6
		IF NOT FileExists(oPath.Backup & "/" & i & "_" & sTitel) THEN
			IF i > 5 THEN
				FOR k = 4 TO 1 STEP -1
					IF FileDateTime(oPath.Backup & "/" & k & "_" & sTitel) <=  FileDateTime(oPath.Backup & "/" & k+1 & "_" & sTitel) THEN
						IF k = 1 THEN
							i = k
							EXIT FOR
						END IF
					ELSE
						i = k+1
						EXIT FOR
					END IF
				NEXT
			END IF
			EXIT FOR
		END IF
	NEXT
	sUrl_Ziel = oPath.Backup & "/" & i &"_" & sTitel
	FileCopy(sUrl_Start,sUrl_Ziel)
END SUB
-----------------------------

Changing priority back to 'medium' since the number of duplicates is lower than 5