How can I sync a shared folder across 4 NAS?

Hi everyone!

I have a LInux and a Windows server and I'm looking for a solution that can allow me to keep a folder (on 4 different nas in different locations connected by vpn) synced.

This means that if I'm in location 4 and add a file I expect location 1,2,3 to get that file in minutes
If I'm in location 2 and delete a folder I expect location 1,3,4 to delete that folder too

The more "updated" should win...

The share is a normal samba share on different kind and brands of NAS.

Thanks for the help!
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ltpittAsked:
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Joseph O'LoughlinSenior TechnicianCommented:
One option.  Install Always sync and Go on a Windows system that has access to all four nas boxes, choosing to install the synchronization service.
Configure a job.  You can add additional folders to synchronize.  In the advanced job properties define delete behavior.  
Verify it's working, then install a license, and schedule the job.
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ltpittAuthor Commented:
I forgot an important bit: free software :)
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Joseph O'LoughlinSenior TechnicianCommented:
rsync on linux
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ltpittAuthor Commented:
rsync will sync every folder to the last updated?
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Joseph O'LoughlinSenior TechnicianCommented:
RSync just uses the filesystem's attributes, not maintaining metadata separately, so for each pair of folders you run rsync the --delete option only works on one, so deletions don't propagate correctly.  
Always sync uses it's own metadata repository in a separate folder, so handles the situation better.
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ltpittAuthor Commented:
I've found it!

Bittorrent sync does greatly and very easily the job :)
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ltpittAuthor Commented:
It worked perfectly and it was a breeze to setup
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