on set p2 backup...

When backing up p2 footage on set what is a decent cost effective external hard drive set up for backing up files/data. Is it possible to use a couple 1tb 7200 standard hard drives simply as storage devices? I don't want to capture the data to the storage array that we will be editing/ generating effects with. These may be silly questions but I am new to video and p2 in particular. Basically what I need to know is can I use any high capacity/ high speed drive to backup p2 files and then transfer that data later to a Raid configuration for post? And what sort of data transfer rates can I expect when dumping p2 footage onto external drives? Is it easier to log/ capture into FCP on set or simply save the files directly from the p2 cards to the external drives?