Hybrid disaster recovery — do's and don'ts

Hybrid disaster recovery combines on-premises infrastructure with a cloud-based recovery target. It is the dominant DR architecture for modern organisations organisations today. It is also where some of the most expensive and avoidable DR failures occur — not because the technology is inadequate, but because the design, testing, and operational discipline have not caught up with the architecture. Hybrid DR rewards rigour and punishes assumptions.

The do's

1. 1
   Test both environments independentlyCloud failover and on-premises recovery have different failure modes, tooling, and people. Test each on its own before testing them together.
2. 2
   Plan for data sovereigntyKnow which categories of data can be replicated to which cloud regions. Discovering during an incident that your recovery target is in a prohibited region turns a DR event into a regulatory event.
3. 3
   Account for bandwidth as a design variableCalculate the realistic data change rate, verify the available bandwidth, and design replication around what the link can actually carry.
4. 4
   Write environment-specific runbooksA single runbook that says "fail over to cloud" is not a runbook. You need step-by-step procedures for each environment accounting for its specific topology, credentials and dependencies.
5. 5
   Include network reconfiguration in the DR planDNS, firewall rules, VPN, load balancers — all change in a hybrid failover. Treat reconfiguration as a first-class step, not a footnote.

The don'ts

1. 1
   Don't assume cloud is faster to recover than on-premisesCold standby in cloud has a longer RTO than warm on-premises. Measure your actual cloud RTO under test conditions.
2. 2
   Don't ignore egress costsRecovering large datasets from cloud storage can be more expensive and slower than expected. Calculate egress for a realistic DR scenario before you need to execute one.
3. 3
   Don't skip dependency mapping across environmentsMap dependencies, model cross-environment latencies, and validate tolerance before the incident.
4. 4
   Don't use shared credentials between primary and recoveryRansomware that compromises primary admin credentials will reach the recovery environment if credentials are shared. Separate credentials and identity providers.
5. 5
   Don't test only in isolationThe transition between environments is where most real hybrid DR failures occur. Test the full path end-to-end.

Closing

Hybrid disaster recovery is one of the most powerful resilience architectures available — when designed deliberately, tested honestly, and operated with discipline. It fails when treated as a technology configuration rather than an operational capability. The bridge between environments is not the replication link; it is the runbook, the test record, and the people who have practised crossing it.