4 External Hard Drives - Help !

[Rikwaller]

Hi,

I am currently running a mac mini for plex, having ripped my dvd collection.

Unfortunately I ripped the collection on a PC and the mac will not let me amend or delete any of the files on my external harddrives. This must be a formatting error on my behalf.

I can live with the above but would like help with the following.

I have 2 x 2tb drives to store video content and 2 x 500gb drives to stroe music.

is there a program that I can use that will recognise any changes made to the drive when connected to my laptop and automatically copy the content across to the other drive ?

Currently I am just adding any new films manually to both drives and it is driving me potty!

Your help would be greatfully received.

Thanks

Simon