PS4 game saves on cloud or on local device?

So basicly, what i need to know is that if it's possible to play your save files on a different PS4 device?

My plan; purchase Bloodborne without owning PS4, but i'm able to borrow the device from multiple friends. Is that plausible in any way?

EDIT: i would be perfectly fine with the ability to have the savefile on USB stick too.

@groowagon:

Get PS+ and upload save data to the cloud.