How to change the file format and automatic save time period of backup file?

In case that you fail to save file when electricity power off suddenly, ZWCAD automatically save your drawing as a backup. The backup file with .SV$ as default extension, you can change this extension and you also can change the time period for each automatic save.

Enter command ‘options’ and got to ‘Open and Save’ tag, here you can customize the time period and file extension for automatically save backup.

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