2012

Use Backup Files
In the Open and Save tab (Options dialog box), you can specify that backup
files are created when you save drawings. If you do, each time you save a
drawing, the previous version of your drawing is saved to a file with the same
name and a .bak file extension. The backup file is located in the same folder
as the drawing file.
You can revert to your backup version by renaming the .bak file in Windows
Explorer to a file with a .dwg extension. You may want to copy it to a different
folder to avoid overwriting your original file.
Save Your Drawing Automatically at Specified Intervals
If you turn the automatic save option on, your drawing is saved at specified
time intervals. By default, files saved automatically are temporarily assigned
the name filename_a_b_nnnn.sv$.
■ Filename is the current drawing name.
■ a is the number of open instances of the same drawing file in the same
work session.
■ b is the number of open instances of the same drawing in different work
sessions.
■ nnnn is a random number.
These temporary files are automatically deleted when a drawing closes
normally. In the event of a program failure or a power failure, these files are
not deleted.
To recover a previous version of your drawing from the automatically saved
file, rename the file using a .dwg extension in place of the .sv$ extension before
you close the program.
See also:
■
Recover from a System Failure on page 234
To restore a drawing from a backup file
1 In Windows Explorer, locate the backup file identified by the .bak file
extension.
2 Select the file you want to rename. You do not need to open it.
Create and Restore Backup Files | 233