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Shearwalls is a complex program that allows the modeling of large, intricate structures. As we cannot predict or test even a small fraction of the combination of structures and design paths that will be encountered, errors that result in the termination of program operation are inevitable. Unfortunately, they are more likely for structures that are also difficult to reconstruct if the last stable configuration was not saved.
For this reason, the program saves two files to the Application Data folder: BackupPre.wsw and BackupPost.wsw. The first of these saves a project file immediately before design or load generation, the second saves the file after design or load generation.
Note that these files pertain the the most recently designed project only, and opening and designing a new project will overwrite a backup file for another project. The files are for emergencies only, not to replace the ordinary backing up of the data files on your computer.
These files are accessed in the following situations
1. If an unsaved file is lost after a successful design or load generation is made, for example by an automatic system reboot. Either file can be used for this.
2. The file BackupPre is used to record the state of the program before design/generation, so that if a fatal error occurs during one of these processes, you will have a file to send WoodWorks technical support for diagnosis. In most cases, this file cannot be used to continue work, as the error will likely occur again on the next design.
3. The file BackupPost is used to continue work if an error occurs during design or load generation, or at any other time. It will return you the state you were in when the last successful design or generation occurred. Then you can try to remake the changes you made to your structure, and it is possible the error will not re-occur. If it does, contact Woodworks Technical support and they will try to diagnose the problem and find a work-around.