networking solution

I have a task, Our Organization have a network if Organization loose the entire network due to critical situation.So IT department want to create network on another location if this situaion occur. IT have a server which have all the backup data.Now what should we do for configuration. Through this configuration some specific users can access the follwing things

1 Access the mail
2 access the data
3 and can print also

please help as human brother .
MAy God Bless you,
Regards to all who help me or not.