BricsCAD uses 2 file extensions to make backup copies: BAK and SV$. Both files are in essence DWG files, so you can rename them (using the Windows Explorer) if you want to recover a drawing.
Each time a drawing is saved, the previous version of the DWG file is saved to a BAK file. This BAK file is created in the folder of the DWG file which is being edited.
The creation of BAK files is controlled by the ISAVEBAK system variable.
If ISAVEBAK = 0 (zero) no BAK files are created.
When automatic save is turned on, BricsCAD will automatically create a backup copy of your work at preset time intervals.
When the automatic save kicks in, BricsCAD saves the currently open drawing(s) as SV$.
The time interval (in minutes) at which the automatic save kicks in, is controlled through the SAVETIME system variable. BricsCAD restarts this interval timer whenever you save the drawing.
If SAVETIME = 0 (zero), the automatic save is turned off.
The path to the folder where BricsCAD saves the temporary files is specified by the SAVEFILEPATH system variable. By default this is: C:\Users\[Username]\AppData\Local\Temp.
What is the purpose of BAK and SV$ files and how are they used and controlled?