What is cloud disaster recovery & How to design it
Security of the data should be the highest prioritized task when it comes to hosting a web application on the server. With any of the means, the server can experience the failure and you can lose the data. It could be by introducing the newer update of the application or any other additional software or in the rare case it can even occur from a natural disaster.
Loosing of the data could be an irreversible disaster. So it is always important to have a disaster recovery plan well in advance. The following discussion is for cloud disaster recovery.
Business continuity planning
The business continuity planning is the dominant part of disaster recovery planning. There are majorly two points to consider for it.
Recovery time objective(RTO)
It is the maximum acceptable length of time that your application can be offline.
Recovery point objective(RPO)
It is the maximum acceptable length of time during which you can bear the loss of data from your application due to any of the incidents.
Designing the disaster recovery plan
The following points are needed to be considered when planning your disaster recovery plan.
Design according to your recovery goals
The recovery strategies are needed to be planned for various possible scenarios. The recovery plans made should be able to target the specific aspects. In case of historical compliance-oriented data, you don't need the speedy access to the data wherein for the occurred interruption it has to be done as quick as possible.
Design for end to end recovery
The plan should be made such that the recovery of the data should be made completely, rather than just backing up or archiving the plans.
Make your Tasks specific
During when you have to run the disaster recovery plan. The plan must be specific about what task it has to execute. For example run the restore script is too general and the specific and concrete way of that could be /home/restore.sh
Implement control measures:
Precaution is always better than cure. If it is possible to avoid the disaster it is always a better option rather running with a recovery script on the server. By implementing certain control measures that can monitor the aspects and alerts the administrator when the flow of the system has been derailed and can result the possible disaster the necessary actions will be taken to avoid the same.
Integrate your standard security mechanism
Ensure that the security aspects involved in your server are also listed under the recovery strategies.
Keep your software licensed current
Your recovery strategies can involve any number of softwares as the execution part of it. You must be aware and assure that the software is licensed all the time. Failing to which can cause the unpleasant actions and can be a massive barricade to the recovery functionality.
Maintain more than one data recovery plan
There must a plan ‘B whenever you make any of the strategies. When you create a backup and restore plan don’t settle for the single plan. Design a plan B that will act as the backup plan when the plan A fails to act. Both the plans must be designed in such a way that they are capable of providing the complete end to end recovery.
Check your plan Regularly
You must check your plan regularly and it should be updated according to any changes occurred in the server. A missing update to the recovery plan can also cause the misbehaviour of the recovery plan.
Design your recovery plan and implement it on your cloud server to be at the safer side to face the unpredictable disaster.