The document describes different disaster recovery methodologies including hot site, warm site, and cold site options that can be provided on demand from a private cloud or traditionally with physical infrastructure. An on-demand hot site provides the shortest RPO of 30 minutes and RTO of 1 hour by keeping application and database servers ready in a private cloud. An on-demand warm site has an RPO of 2 hours and RTO of 4 hours by maintaining operating systems and applications ready. An on-demand cold site has an RPO of 6 hours and RTO of 24 hours by backing up to an online storage service.

1. DR on Demand Methodology

2. Hot SiteFirewallLoad BalancerApplication ServersDB ServersInternetInternetBackup ServerStorageDR SetupPrimary Setup

3. On Demand Hot SiteFirewallLoad BalancerDBAppAppLBFWOSOSOSOSOSApplication ServersPrivate CloudDB ServersInternetInternetStorageStorageStorageBackup ServerPrimary Setup

4. On Demand Hot SiteFirewallLoad BalancerAppDBAppLBFWOSOSOSOSOSApplication ServersCloudDB ServersRPO 30 minInternetInternetStorageRTO 1 hrsBackup ServerStoragePrimary Setup

5. Traditional Warm SiteFirewallLoad BalancerApplication ServersDB ServersInternetInternetBackup ServerStorageBackup ServerStorageDR SetupPrimary Setup

6. On Demand Warm SiteFirewallLoad BalancerDBFWOSOSApplication ServersPrivate CloudDB ServersInternetInternetStorageBackup ServerStoragePrimary Setup

7. On Demand Warm SiteFirewallLoad BalancerAppDBAppLBFWOSOSOSOSOSApplication ServersPrivate CloudDB ServersInternetInternetStorageRPO 2 hrsRTO 4 hrsBackup ServerStoragePrimary Setup

8. Cold DR Services…RPO 72 hrsRTO 720 hrs

9. Traditional Cold SiteFirewallLoad BalancerApplication ServersDB ServersOffline ShipmentsInternetInternetStorageStorageBackup ServerDR SetupPrimary Setup

10. On Demand Cold SiteFirewallLoad BalancerBKPOSApplication ServersDB ServersOnline Backup AppPrivate CloudInternetInternetStorageBackup ServerStoragePrimary Setup

11. On Demand Cold SiteFirewallLoad BalancerAppDBAppLBFWOSOSOSOSOSApplication ServersPrivate CloudDB ServersInternetInternetRTO 24 hrsStorageRPO 6 hrsBackup ServerStoragePrimary Setup