Most organizations have a disaster recovery plan. Most of those plans have never been tested under realistic conditions. That gap is the difference between recovering in hours and recovering in days -- or not recovering at all. The documentation is the starting point. Testing is what makes it real.
Start with a Real Risk Assessment
A risk assessment that lists "earthquake, flood, cyberattack, power failure" without prioritizing them against your actual geography, infrastructure, and threat model is not useful. Start with your actual threats. If you are in a low-seismic region with no data center flood risk, ransomware and hardware failure deserve more planning attention than natural disasters. If you operate in a region with unstable power, generator capacity and UPS rundown times belong in the risk profile.
The risk assessment shapes everything that follows. Organizations that skip this step or use a generic template often end up with plans that address scenarios they will never face while leaving their real exposures undocumented.
Define RTO and RPO Per System
Recovery Time Objective (RTO) is how long the business can tolerate a system being down. Recovery Point Objective (RPO) is how much data loss the business can accept. These are business decisions, not IT decisions -- and they should be made with input from business leaders, not set by IT alone.
Your ERP system and your marketing intranet have different answers. Define them explicitly for each critical system. The answers drive your backup frequency, your replication strategy, and how much you spend on recovery infrastructure. Organizations that set a single RTO and RPO for everything either overspend on low-value systems or underprepare for critical ones.
Document at the Task Level
A recovery procedure that says "restore the database server" is not a procedure. It is a goal. The actual procedure lists every step: which backup to restore, which server to restore to, the exact commands, the verification steps to confirm the restore succeeded, and who to notify at each stage. That level of detail feels excessive until you are running a recovery at 2 AM with someone on the team who has never done it before. Then it is the most valuable document you have.
Assign an owner to every step. "IT team" is not an owner. A named individual is an owner. When an incident happens, ambiguity about who does what costs time you do not have.
Test -- and Test Regularly
Annual testing is the minimum. Quarterly testing for critical systems is better. Test the actual recovery, not a tabletop discussion of what you would do. Restore from backup. Fail over to your DR environment. Time the process against your RTO commitments.
In my experience, the first real test of a DR plan almost always surfaces at least one gap. A backup job that had been silently failing. A recovery step that assumes access to a system that is also down. A procedure that was written for a system version that no longer exists in the environment. Finding these gaps during a scheduled test is inconvenient. Finding them during an actual incident is costly.
Update the plan after every significant infrastructure change and after every test. A plan that reflects last year's environment is not a plan for this year's incident. The organizations that recover quickly from serious incidents are the ones that practiced. There is no substitute for that.