It asks you when you boot a game whether you want to cloud saves. |
Automatic download/upload does everything for you, just enable it in settings on the XMB and choose a time of day for it to activate. It will then automatically sync trophies, patch any games you've played recently, update firmware, upload saves etc.
Join our PS3 BF3 server! Search for 'Better than Halo' in the browser and bookmark us, and/or add me on PSN (ThemisB). We play most nights from 8pm GMT. See you on the Battlefield!