At a minimum, full backups of all Disk Groups, the database, transaction log, etc. should be backed up to removable media and taken to an off-site location to allow for full disaster recovery in the event of the server or server room becomes unavailable. The off-site location should be chosen with the following aspects in mind:
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Accessibility of the site
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Security of the site
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In a location as far from the customer location as possible while still remaining accessible in an amount of time to maintain the disaster recovery requirements set forth by the organization's policies and procedures