Thanks for the answer but what if SQL Server 2005 Express Edition with Advanced Services is installed?

Do you have to use this one?

http://www.microsoft.com/downloads/details.aspx?familyid=B448B0D0-EE79-48F6-B50A-7C4F028C2E3D&displaylang=en

255MB?

or can I just install the one from...

Thanks Tom & James for the replies, I'll check and change the WITH INIT addition and see what the Red Gate's backup is about.