what is the best site back up method ? including all DBs

using the cPanel auto backup :D

For now I would let Dathorn worry about that. If you want to know for when you get your own server, then backing up to Tape or to another server is the best. There are many scripts to help you do this.

Using 2 drives in the same server is better then nothing, Raid is helpful but not really a backup.

Of course cPanel can handle some of it.

I have a 2nd drive in all of my servers, and use cpanel to backup to that 6 days a week. On the 7th day, I switch cpanel to remote ftp backup, and backup the entire server to a remote ftp server.

I think this is be most cost effective solution.