File sorting program for Windows 10

Hi all,

I have a small issue that I hope you guys can help with. We back up all our staff's data in their personal directories. Unfortunately they are not very diligent in only backing up work related items and we also have a lot of duplication of files as every time a machine is reloaded a backup is made, however they never clean out the duplicate files. My backup now stands at 6 TB - not a lot, however it does affect my offsite backup time.

My questions are: Is there a program out there that can sort files per extension firstly, and secondly, what is the best program to find duplicates.

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NVITEnd-user supportCommented:
> ... what is the best program to find duplicate
That's subjective, of course. Here are several Open Source ones:

Here's one that's been updated more recently:

The popular CCleaner also has a duplicate finder option:

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I'll add a little warning about these duplicate-killers: imagine when someone has a word document that uses all sorts of things embedded and linked in it. You kill some of those files because they are duplicates - the word document breaks apart.

My advice for data house keeping is: let workers agree to an archiving guideline: what is older than x years will be automatically moved to a similar file structure inside your archive. The only way to keep the volume of backups in control.
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Windows 10

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