Use the File Save Options dialog to specify the maximum number of backup files and other settings related to file saving.
To open the File Save Options dialog, use Save As from the application menu, and click Options in the Save As 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.