This may sound trivial to some but I have miss placed my instruction book for PS3 and wondering if it is possible to play a game on my system and then download it to a friends system with out wiping out his data?
Yes. In most cases you can copy your PS3 save data (game data is parts of the game that are stored on the hard disk to decrease load times, and has nothing to do with your game progress) to a USB flash drive, and carry it around with you. As long as you create a PS3 User profile for yourself on your friend's PS3, and don't play under his login profile, you can copy your save data to his PS3 and use it, without overwriting any of his save data. When you are done, you can copy it back to the flash drive and bring it home. There isn't much point, as you can't both play at the same time on one PS3, but you can do it. If you are a Playstation Plus subscriber, then you can use the online storage feature to store your PS3 game save data (PS3 only, doesn't work for Minis or PS1 Classics) on the PSN servers. You can download it to any PS3 that has a user profile linked with your PSN account. This is the only way to copy save data from games that prohibit copying of their save data (such as Demon''s Souls and Dark Souls) to another PS3.