Does anyone know if EPiServer has Disaster Recovery documents on what is needed for DR and what their recomendations are for servers?
I haven't seen any documents like that comming from EPiServer. I wouldn't think they are much diffrent then any other document would be on the issue. Take backups of your database and vpp and keep your code in source control.
Should you want a more official answer I would recomend sending a issue to Support about it to see if they have any of the documents you require.
You need to make sure you deploy your code to your DR environment each time you update production and make sure you replicate the database and VPP to DR.