Community Tracks Questions

[Gscorpio14]

With the servers closing in a couple months I would like to download and save as many of the best tracks as possible to play in the future. How many community tracks can I download? Is there a limit or a number I shouldn't download past for the sake of the PS3 running properly? I was thinking about getting all the top, highest rated, and most raced but that might total around 2000 tracks. Is that too much for the PS3? Anyone know any great community tracks / creators to look into or recommend any awesome tracks? Please don't ask for downloads if you need the XP trophies as they are fastest achieved by publishing downloading & unpublishing with multiple accounts. Also is there any way of backing up user creations to a usb drive or something since they are saved to game data?