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The RPO is expressed backward in time ( that is , into the past ) from the instant at which the failure occurs , and can be specified in seconds , minutes , hours , or days . In some circumstances you may receive distributions from your Plan while you are still employed with the University . Forms available to update faculty and staff employee records and process activity related to initial employment ; a change during employment including promotion , transfer , hours change , leave of absence , etc .; and separation from the University . The RTO is measured in seconds , minutes , hours , or days , and is an important consideration in disaster recovery planning ( DRP ) . An eligible class is defined as an exempt or non-exempt employee regularly scheduled to work at least 17 hours a week , or a faculty member with at least a half time , two-semester appointment . If the RPO is five days ( 120 hours ) , then backups must be made at intervals of 120 hours or less . Her writings encompass subjects such as international institutions , trade and monetary policy , and democracy and disputes . It seems obvious , but defining primary keys can get messy when data rows get moved to other tables .