Is it:
1/Save all my variables in individual fields on a database? (I have a lot of vars)
2/Save a players data in an asset bundle- somehow upload that to the server (can wwwform do this?)
3/Somehow upload the playerprefs file to the server.
4/Pay somebody like Dimerocker for doing the hard part and use their api to store cloud data.
5/Royal mail
?
Cheers