Cheap and easy way to sync a folder over the Internet with 3 computers

I am looking for a cheap (no cost) and easy way to do what this service does.

I have a folder I want to sync with 3 of my computers, over the Internet.  When I am at the office, I want to use the files, then when I go home I want to use the files, then when I log into my laptop (always online), I want to use the files.  I am wanting local copies of the folder, so no FTP.

Is there a free solution to this?
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Alan Huseyin KayahanConnect With a Mentor Commented:
  Hi murryc
     Following link contains Synctoy in Windows Power Toys, it is free
if one of the computers is windows server thats always online and the others are mostly online.
you could use microsoft's DFS and let it replicate the data.
not the best solution, but its cheap (free), light on performance, and does basically what you wanted.
just set a shared folder with 3 sources (the 3 computers) and let it do its magic.

more reading on dfs
I would use dynamic dns for the laptops thats always online and then use RDP
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I think that SyncToy is the easiest therefore the best way.
murrycAuthor Commented:
No server OS here, so DFS is out.

I know I said no FTP, but it seems the solution must use FTP in some way, to move files over the Internet and into each computer, without having to port everything.

I am looking at right now, but this might not be the right solution.  Anything else like this for free?
Alan Huseyin KayahanCommented:
 Did you check cynctoy?
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