mirror server

Hi all,

I want to setup an exact mirror of a windows 2003/IIS 6 web server. I
have 2 windows 2003 servers connected via the internet and VPN if
required. The intension is to have the 2nd as a failover if the
primary server (or internet provider) fails.

I have got Robocopy working fine so it copies the files I need to
replicate + the security attribs etc, however I have no idea how to
copy the user accounts from one machine to another (also sycronising
the ids for the users SIDs ?)

Can anyone help me out with this one ?

Software such as securecopy is no use.. its very slow and cant monitor
for file changes efficiently (I have written a small app which can
monitor file access and runs robocopy just on folders which have files
change in them).

Thanks