From AroDEV comes AroCLEAN...
(Translated from the original French by Google Translate.)
"Revit is a wonderful tool to assemble and operate all project information in a single file.
"The advantage of centralizing all the elements of a project is to be able to ensure the consistency of documents built. Revit and it does it very well.
"The disadvantage is the risk of losing everything by the mere loss of a computer file. In this Revit with visceral fear causing it to make multiple backups and additional copies of our Project files RVT & Family FRG.
"If you do not take care this procedure fills and saturates our local and / or servers hard drives.
"AroCLEAN offers to clean these files backups and copies to take care of the free space on your disk storage space recovering without giga bytes.
"Until January 1, 2014 you can download and use for free."
This product appears to be in open Beta.
There's more information available on the French AroDEV website.
Credit: Luke Johnson's What Revit Wants blog.