Can you provide more information? Your question is generic and adding more information would assist the community with providing you with some recommendations.
I would start by:
Defining your definition of "optimizing storage" - Some would say "just enable de-duplication" assuming this is not enabled.
Providing more information about your platform - AFF/FAS/CVO/etc
How you are seeing duplicate files and your ideal end state.
Do you have any constraints around installing software or using scripts for this process?
That is a start, but more information will help those trying to help you..... and I hope that this helps!