Steam Version: Save on other Computer/Backup

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Sorry for my bad english....

I have the steam version of the game, heard storys about corruptet save files etc.
i tried to install the game on another computer of mine and noticed that it starts me from zero...

is there a way to use the same user on different computer / backup my save?

and is there a way to see my pvp name because im not 100% sure which one i used....