Redundant (Mirrored) Servers Windows 2K3 R2

[invadmin]

I am looking to mirror one Plesk 8.1 server running Windows 2K3 R2 to another Server of the same build. These servers are housed in two geographically different datacenters. I am looking to set this up for redundancy and also to use as primary and secondary Name Servers. Does anyone have experience or information configuring a scenario such as this? Any help would be greatly appreciated. I have a question abuout backups. Has anyone use Backup Exec 10D or 11 to successfully backup a Windows Based Plesk server? Also, are there any benifits to using SmarterMail add on module?