I was intrigued by this subject - so tried something and got an interesting result.
I found that in certain cases CCleaner's Duplicate Finder can work on Networked drives.
It depends just what type of network it is, and how the drive is networked.
I have a drive connected to my router (BT Smart HUB 2), it's plugged into the USB port on the hub.
(Currently it's a thumb drive, but I have had a HDD on there as well for doing backups).
That drive is mapped as a Network drive, (Z), on both my laptops, with the folders shared so that both laptops can read and write to it over wifi.
I deliberately created copies of a small text file and a jpeg image on that drive.
Then I fired up CCleaners Duplicate Finder, Include>Add, browsed to the 'Z' drive no problem, and made the include for all file types.
Searching 'Z' drive found the duplicate files.
I selected the duplicates and clicked 'Delete Selected' - the duplicates were deleted.
Checking in File Explorer the duplicates are indeed gone.
OK it's a Windows mapped drive not a Samba share, so the comments from @johnccleaner still stand.
It is still interesting though that Duplicate Finder was able to do what it did on a shared drive connected over wifi on a Local Area Network.
Although perhaps not that surprising, it's not that different to plugging a drive directly into a USB port on the computer.
However trying to go further and set a certain filetype for cleaning on the networked Z drive, as an Include in Custom Clean, it wouldn't let me.
Which is as expected, it would be a security hole if you could do that and delete <em>original files</em> from such a drive.
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