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CAD tip CAD tip # 4345:

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What is the difference between .BAK, .SV$ and .AC$ backup files?

A - answer These file types are different backup and temporary files created by AutoCAD.
  • BAK files are backup files created on manual Saves (save commands) in AutoCAD (previous DWG versions)
  • SV$ files are automatic timed backups (autosave) of drawings (deleted on successful AutoCAD exit)
  • AC$ files are temporary AutoCAD working files for various functions (undo, hidden lines...), ac$ files do not contain drawing data

Some AutoCAD functions may also create .TMP files with temporary data (drawings cannot be reconstructed from these files).

100% *  CAD 
12.4.2005    37662x  
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See also:
Tip 10612:Revit error: Unable to open because of unresolved pointer references​
Tip 10317:How much slower is saving DWGs to A360 cloud?
Tip 10206:How to batch-delete all OldVersion folders?
Tip 9879:How to change e-mail address in your "Autodesk ID" account?
Tip 9507:Easy selection of DWG backup files to restore.

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