Question for Purchasing through Steam

If I buy [and download] a game through Steam, can I copy it on a disc and keep it and install on however many PCs I want (or if i reformat my PC if I can redownload the game and install and play it again)?

In other words, I'm asking if Steam is like D2D through which if I lose the game from my  HDD I can just redownload and use the same key to unlock and play the game.

Please let me know... thanks in advance! 

In addition towhat tkemory said, you can also make a backup copy of any Steam game and burn that to a disc. 

There's an option to do this built into Steam, and it's very easy to use.  This feature saves you the time of re-downloading your game.

Ohhh ok good. I just purchased Sacred 2 and was worried about that. Should've asked before but I played the trial and it brought back memories of the Diablo 2 days (for the hack and slash and loot addictiveness) so I had to buy it lol.

Thanks 

Ohhh ok good. I just purchased Sacred 2 and was worried about that. Should've asked before but I played the trial and it brought back memories of the Diablo 2 days (for the hack and slash and loot addictiveness) so I had to buy it lol.

 

Thanks 

theking52_TDK