User account back-up

We have a dell server with Microsoft Small Business server, which is in real

need of updating. I need to increase the hard drives within the server

however in doing this I will have to format the existing data. This should be

a major problem, however I need to back-up or make a report of all users,

user permissions, user email addresses and any other info surrounding user

account. Does anyone know of a tool that can do this? I will be making a

Microsoft back-up however because I am changing the storage size I am a

little worried that the back-up I make will not recover correctly, which in

turn is why I need to find a tool to do all the above.

Thanks