Before choosing a second cloud provider: a practical recovery checklist

 UCELI provides cloud servers and domain services. This educational article was prepared with AI assistance. It does not describe a managed disaster recovery service or guarantee that UCELI backups are available or recoverable.

A second cloud account can give you another place to run an application. It does not automatically give you a recovery plan. Both environments might depend on the same DNS provider, identity system or encryption key. A database copy might be out of date, and changing DNS does not stop the original server from accepting writes.

Before comparing server prices, map the dependencies and rehearse a recovery using test data. These checks are for infrastructure you own or are authorized to test. They are not a guarantee of failover or zero data loss.

1. Define what must recover

Choose one workload and write down two targets:

  • Recovery time objective (RTO): the maximum interruption the business intends to tolerate.
  • Recovery point objective (RPO): the maximum amount of recent data, measured in time, that the business intends to risk losing.

These are planning objectives, not measurements of what your setup currently achieves. Record the last successful recovery test and its actual duration and data age. AWS describes the difference between recovery strategies and why restore or provisioning steps can increase recovery time and data loss in its disaster recovery architecture guidance.

2. Map shared dependencies

For every item, record its provider, owner, account access and what happens if it is unavailable:

  • DNS, domain registrar, CDN or reverse proxy, certificates and certificate renewal.
  • Identity provider, multi-factor authentication and the credentials needed to reach the recovery environment.
  • Encryption keys, secrets, configuration, software images and deployment artifacts.
  • Databases, object storage, file uploads, queues, scheduled jobs and third-party APIs.
  • Monitoring, status communications and the network routes needed by operators.

Ask a concrete question for each dependency: Can the recovery team use it if the primary provider or its control panel is unavailable? Do not assume two servers in different clouds are independent when they both need the same unavailable login or key service. Store recovery instructions and access details securely, with an authorized alternative contact. Test access without weakening security controls.

3. Plan one writer and a consistent recovery point

List every place that can change state: the database, uploads, background workers and external actions such as payments or emails. Record how each component is backed up or replicated, the observed replication delay, and how a recovery point is chosen. A copied database and a separately copied upload directory may represent different points in time; establish and test an application-consistent recovery procedure for your own system.

Decide who can authorize promotion of the recovery environment and how the original writer and workers will be fenced or stopped before the replacement accepts writes. Fencing means a verified mechanism prevents the old writer from accessing the resources it could change; losing contact with a server alone does not prove this. DNS alone is not a write lock: users with cached addresses or existing connections may still reach the old site. Plan how to reconcile data before switching back. If you cannot verify that the original writer is fenced, do not assume it is safe for the replacement to accept writes; escalate using your incident procedure. Never assume both sides can safely write at once.

Replication is also not a substitute for a separately protected backup: accidental deletion or corruption may be replicated. Restore an authorized test backup into an isolated environment using synthetic or appropriately protected data; verify application-level records and files, not just that the restore command completed. Record what was actually tested. AWS discusses backup as a separate protection even when data is replicated in its architecture guidance.

4. Rehearse the DNS decision without changing live traffic

Inventory the production record, current TTL, DNS operator, health-check behavior and whether users reach an origin directly or through a proxy. If a future change needs a lower TTL, plan it in advance: resolvers that already cached the old answer can continue to use the old TTL. Some software has additional caches and may not honor the TTL exactly. See AWS’s DNS troubleshooting guidance and routing guidance.

For a non-production drill, use an isolated test domain you control and two test endpoints with distinct labels. Pick recursive resolvers that can actually resolve that test domain; a private zone may not be visible to public resolvers. Record the authoritative answer and responses from selected recursive resolvers before and after an authorized change; note time, resolver, answer and remaining TTL. Test from representative networks if available. Compare the observed transition with your RTO, including human decision time and application startup—not DNS alone. Do not alter the production record as part of this exercise.

If a CDN proxies the hostname, a public DNS answer may identify the CDN rather than the origin; the recovery action and caches may be different. For example, Cloudflare documents separate TTL behavior for proxied records. Apply your own provider’s rules rather than assuming that lowering a public TTL changes the proxy’s origin routing. A DNS update alone does not prove users can authenticate, read correct data or complete a transaction.

5. Put a price on the whole rehearsal

Before committing, estimate costs for standby compute and disks, backup storage and retention, replication and inter-provider data transfer, public IPs, DNS queries or health checks, monitoring, licenses and support. Include engineering time for restore drills, patching and maintaining a runbook. Prices and transfer terms vary by provider, region and usage; obtain current quotes rather than comparing only a monthly VM price.

Finish with a short runbook: decision owner, conditions for escalation, recovery steps, write-fencing checks, verification criteria, rollback or failback plan, and evidence from the last drill. If an item is untested, mark it untested. A second provider becomes useful recovery capacity only after the dependencies, data and operational steps have been checked together.

Explore UCELI Cloud Server locations to compare locations and configurations. Confirm available features, network terms and final charges for your selected configuration. For presales questions, email support@uceli.com.

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