In the last couple of years, we have moved away from a passive approach to IT continuity planning -- storing tape...
data off site and recovering from a failure by finding a new compute facility and restoring the tapes -- to a much more active model. Cloud backup is the first step in the transition, with on-premises and off-site tape giving way to online cloud storage.
The simplistic cloud backup approach leaves us with the dilemma of where to recover. We still need to find a home where applications can run and be able to get data to them. With WAN speeds still woefully behind LAN performance, uploading data to the recovery site can take days.
The obvious answer is to move the apps to the data by running the recovery in the cloud. This IT continuity planning method may be easier said than done, since effective performance generally requires apps to be cloud ready, making them suitable for multi-instance operation. Cloud-based recovery is very difficult for so-called legacy apps, especially COBOL programs running on mainframes.
An intermediate step toward full cloud recovery might be to contract for a standby arrangement at a telecommunications facility. These usually have very fast fiber links to the major cloud data centers and also have mainframe gear available. This would reduce data access latencies to an acceptable level.
Drive-based storage in the cloud
Another major change in both backup and IT continuity planning is the use of disk or solid-state drives by the cloud vendor, rather than tape. Recovery from a backup, or even a disaster, may involve only the recovery of a few files. Searching tapes is extremely time-consuming; drive-based storage in the cloud allows individual files to be pulled rapidly, changing the way recovery is done.
As always, remember to have a workable disaster recovery (DR) plan and to test it regularly. I've seen data centers go down for various reasons, ranging from a technician forgetting to fill the generator with fuel, to a storm causing the loss of both data centers in the same town. Good IT continuity planning requires geodiversity in off-site storage. Preferably, use a cloud zone well away from your home state.
That holds true for cloud-to-cloud backups and DR, too. Zones go down due to power or weather issues, so make sure one data copy is in another geographic area, and watch out for multiple zones in adjacent buildings.
More tips on cloud recovery planning
Cloud DR advantages include affordability, flexibility
Six stages to cloud disaster recovery execution
Dig Deeper on Disaster recovery planning - management
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