When using Save As from the application menu, click Options in the Save As dialog, and specify the following in the File Save Options dialog:
- Maximum backups. Specifies the maximum number of backup files.
- Preview. Specifies the preview image that displays when you open or save a project. The default value for this option is Active View/Sheet. Revit LT can create a preview image only from open views. If you select Regenerate if View/Sheet is not up-to-date, Revit LT updates the preview image whenever you open or save the project. This option can consume considerable resources on a complex model. Use it only if you want the preview image to update frequently.