Backup & disaster recovery
Backup and disaster recovery (DR) are critical for ERP systems. A robust strategy ensures that data can be restored and operations resumed after data loss, corruption, or site failure. This article covers backup types, recovery objectives (RPO/RTO), DR strategies, and testing – with links to cloud hosting, cybersecurity, and compliance.
1. Why backup & DR matter
ERP systems are business-critical. Causes of data loss:
- Hardware failure (disk, server)
- Human error (accidental deletion, wrong update)
- Cyberattacks (ransomware, data corruption)
- Natural disasters (fire, flood, power outage)
- Software bugs or failed upgrades
2. RPO and RTO
Two key metrics define recovery requirements:
| Metric | Definition | Example |
|---|---|---|
| RPO Recovery Point Objective | Maximum acceptable data loss (measured in time) | RPO = 1 hour → lose at most 1 hour of data |
| RTO Recovery Time Objective | Maximum acceptable downtime | RTO = 4 hours → system must be back within 4 hours |
RPO and RTO are defined by business impact analysis. Lower RPO/RTO = higher cost.
3. Backup types
| Type | Description | Storage | Restore time |
|---|---|---|---|
| Full | Complete copy of all data | High | Slowest |
| Incremental | Changes since last backup (full or incremental) | Low | Slow (need full + all incrementals) |
| Differential | Changes since last full backup | Medium | Medium (full + last differential) |
| Transaction log | Individual transaction records (for point-in-time recovery) | Varies | Precise |
4. Backup strategy
Best practices:
- 3-2-1 rule: 3 copies, 2 different media, 1 off-site.
- Automate backups: Schedule full weekly, incremental daily, log backups every 15-60 min.
- Encrypt backups: Both at rest and in transit.
- Retain multiple versions: e.g., daily for 30 days, monthly for 1 year.
- Monitor backup success/failure.
5. Disaster recovery strategies
Hot site
Fully operational duplicate, can take over in minutes. Highest cost.
Warm site
Partially equipped; need to load data/software. Hours to days.
Cold site
Empty facility – you provide everything. Days to weeks.
Cloud DR
Failover to cloud region. Increasingly popular (DRaaS).
6. Cloud DR considerations
- SaaS ERP: Vendor manages DR – review their SLA (RPO/RTO).
- IaaS/PaaS: You can use cloud region replication, snapshots, and failover.
- Multi-region: Deploy ERP across availability zones or regions for resilience.
- DRaaS: Disaster Recovery as a Service – third-party manages failover.
7. Testing & maintenance
Backups are useless if you can't restore. Testing:
- Quarterly: Test restore of a random backup.
- Annually: Full DR drill – simulate disaster, failover, and failback.
- Document: Step-by-step recovery procedures.
- Update: RPO/RTO should be reviewed as business changes.
8. Common pitfalls
- No off-site copy: One fire destroys everything.
- Untested backups: First test is during disaster – often fails.
- Ignoring dependencies: ERP may need other systems (middleware, databases) to work.
- No DR plan: Relying on hope.
- Outdated plan: Infrastructure changes, plan not updated.
Key Takeaways
- RPO = max data loss; RTO = max downtime. Set based on business impact.
- Follow 3-2-1 backup rule: 3 copies, 2 media, 1 off-site.
- DR strategies range from hot site (fast, expensive) to cold site (slow, cheap).
- Test backups and DR plans regularly – untested backups are worthless.
- Cloud offers DR options (multi-region, DRaaS) but understand vendor's SLA.
How long should I keep ERP backups? Depends on legal and business needs. Common: daily for 30 days, monthly for 1 year, yearly for 7 years for financial data.
Should I backup cloud ERP? SaaS vendor handles infrastructure backup, but you may want to export critical data (e.g., financials) separately.
What is a DR plan vs backup plan? Backup is about data copies; DR is about restoring entire operations (servers, network, apps).
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