Application for DUPLICATES

Does anyone know of an APP within Synology that would check my complete NAS (DS1522+) for DUPLICATES.
I have the whole family setup onto my NAS - and they backup their mobiles etc…
It would save a tonne of data if duplicates could be deleted in all accounts.
Because we are a family - we always WhatsApp and all the pictures and videos will be in every account - and they are all the same photos and videos - and they also will be duplicated in their own account - where each family member has their own photos.

Thanks

This app exists on your NAS, and it is called Storage Analyzer.

Thanks Paul, just installing it now and playing with it to check what it does and how I need to use it.

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I know you said “within Synology”, however I find the app dupeGuru to work quite well, and offers more flexibility than the Synology duplicate finder.

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Thanks NewLeaf for the tip - but I’m fairly new to Synology and at the moment have not installed an app that needs to be installed from the command line. If you have instructions on how to install it then yes please, I’m interested thanks.