For a start-up creating their disaster recovery plan, which backup site should they opt for if budget is not a constraint and rapid resumption of business activities is crucial?
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Answer Description
A hot site is the most expensive of the backup site options but it offers the shortest recovery time. The goal of a hot site is to be able to be up and running in a couple of hours. The site is a near duplicate of the operational site.
Wikipedia
A backup site or work area recovery site is a location where an organization can relocate following a disaster, such as fire, flood, terrorist threat, or other disruptive event. This is an integral part of the disaster recovery plan and wider business continuity planning of an organization.A backup, or alternate, site can be another data center location which is either operated by the organization, or contracted via a company that specializes in disaster recovery services. In some cases, one organization will have an agreement with a second organization to operate a joint backup site. In addition, an organization may have a reciprocal agreement with another organization to set up a site at each of their data centers.
Sites are generally classified based on how prepared they are and the speed with which they can be brought into operation: "cold" (facility is prepared), "warm" (equipment is in place), "hot" (operational data is loaded) –- with increasing cost to implement and maintain with increasing "temperature".
Backup_site#Hot_site - Wikipedia, the free encyclopedia 