What's New: Creo Parametric 4.0 > Assembly Design > Managing Reference Backups
  
Managing Reference Backups
You can remove manual backups
Release: Creo Parametric 4.0
Benefits and Description
You can watch a video that demonstrates this capability.
To reduce file size and dependencies, you can remove backups that are no longer needed and that were manually created. Backups that are automatically created are maintained. From the Model Tree, right-click a component or a feature of a component, select References, and then select Back Up References or Remove Backups, depending on the desired action for the component. In the Model tab, click Operations > References and then for global changes, select one of the commands listed below:
Reference Control
Back Up All References
Remove All Backups