In your case you can create a folder that contains the earlier versions of the files. For example you can name the folder "Archives" and create copies of the desired files in that folder. Also you can create folders inside the "Archives" folder and name them by using the current date. For example: "1.6.2010".
Please note that the implementation of this scenario is a common programming task and you need to implement it yourself.
I hope the information helps.
the Telerik team