Hello Asatur.
In fact, i don't understand your question. But if you will want save a image of game in on server.
Follow the steps.
1- UserMedia.SnapshotURL: take a picture Media Camera.
If you want take image from your all game screen , will you use the "CanvasSnapshot" instead of "UserMedia.SnapshotURL"
I'm looking for how limit this picture area.
<img src="http://www.pubblicite.com.br/paulotutoriais_nao_apagar/tutorialSaveImageToFolderC2.jpg" border="0" />
2 - Use a PHP to save the picture in your server.
(sorry for my bad English and, some words in printScreen are in portuguese: foto : picture | nome: name | TESTE: test)
that's it!