DRaaS vs Self-Built DR: Which is Better?
A mid-size insurance company spent $150,000 building their own DR site. They bought hardware, set up replication, configured failover, and hired a dedicated DR engineer. Two years later, they tested failover — and it failed. The replication had silently broken 6 months ago. No one noticed because nobody was monitoring it.
They switched to Zerto DRaaS. Monthly cost: $2,500. The DRaaS provider monitors replication 24/7, tests failover monthly, and provides a tested recovery environment. The insurance company's DR engineer now focuses on application modernization instead of babysitting replication.
Self-built DR gives you control. DRaaS gives you reliability. Here's how to decide.
What is DRaaS?
DRaaS (Disaster Recovery as a Service) is a managed service where a third-party provider handles your disaster recovery infrastructure. You replicate your data to their cloud. They handle the hardware, networking, monitoring, and failover orchestration.
Major DRaaS providers: Zerto (now part of HPE), Veeam Cloud Connect, AWS Disaster Recovery, Azure Site Recovery, Rubrik.
What is Self-Built DR?
Self-built DR means you own and operate your own DR infrastructure. You buy the hardware, set up the replication, configure the failover, and maintain everything yourself.
Self-built DR options:
Physical DR site: Your own secondary data center with duplicate infrastructure.
Cloud DR: VMs and storage in AWS/Azure that you manage yourself.
HCI-based DR: Nutanix or VMware cluster at a co-location facility.
Head-to-Head Comparison
Here's what we've seen across 30+ DR deployments:
Upfront Cost:
DRaaS: Low ($0-5,000 setup). Pay monthly.
Self-built: High ($50,000-200,000 for hardware, networking, facility).
Monthly Cost:
DRaaS: $1,000-10,000/month (based on protected data volume).
Self-built: $2,000-5,000/month (power, cooling, licensing, staff).
RTO/RPO:
DRaaS: RPO 15-60 minutes, RTO 15-60 minutes (provider-managed).
Self-built: RPO 0-15 minutes, RTO 5-30 minutes (if properly maintained).
Operational Burden:
DRaaS: Low. Provider handles monitoring, patching, testing.
Self-built: High. Your team handles everything.
Control:
DRaaS: Limited. You're dependent on provider's infrastructure and policies.
Self-built: Full control over hardware, software, and configuration.
Expertise Required:
DRaaS: Basic. Provider handles the complex parts.
Self-built: Advanced. Need dedicated DR/infrastructure expertise.
When DRaaS is the Better Choice
DRaaS wins when:
Your IT team is small (1-3 people). Self-built DR requires dedicated expertise you probably don't have.
Budget is constrained. DRaaS avoids $50,000-200,000 in upfront costs.
You need fast deployment. DRaaS can be operational in days. Self-built takes months.
You want guaranteed SLAs. DRaaS providers offer contractual RTO/RPO guarantees.
You're not confident in your DR testing. DRaaS providers test failover regularly.
The insurance company from the opening story is a perfect DRaaS candidate: small team, limited budget, and they needed someone to actually monitor the DR environment.
When Self-Built DR is the Better Choice
Self-built DR wins when:
You have strict data sovereignty requirements. Some data can't leave your physical control.
You need RPO=0 (synchronous replication). DRaaS typically offers async only.
You have existing infrastructure expertise and capacity. If you already run a data center, adding a DR site is incremental.
You're running specialized workloads (mainframes, legacy systems) that DRaaS providers don't support.
Cost is lower long-term. If you're protecting 500TB+ of data, self-built is cheaper per TB.
A Philippine bank we work with uses self-built DR because BSP regulations require data to stay within their physical control. DRaaS providers in the Philippines don't meet this requirement yet.
Hybrid Approach: Best of Both
Many enterprises use a hybrid approach:
Critical workloads: Self-built DR with synchronous replication (RPO=0, RTO<5 minutes).
Standard workloads: DRaaS with async replication (RPO 15-60 minutes, RTO 30-60 minutes).
This gives you maximum protection for critical systems while keeping costs manageable for everything else. We've seen this pattern reduce DR costs by 40% compared to self-built for everything.
Cost Breakdown
Let's compare real costs for a 100-VM, 50TB environment over 3 years:
DRaaS (Zerto + AWS):
Setup: $2,000.
Monthly: $3,000 (Zerto license + AWS storage + compute).
Total 3-year: $110,000.
Self-Built (Nutanix at co-location):
Hardware: $60,000 (2-node Nutanix cluster).
Co-location: $1,500/month.
Licensing: $500/month.
Staff: 0.5 FTE = $25,000/year.
Total 3-year: $159,000.
DRaaS saves $49,000 over 3 years. But self-built gives you RPO=0 and full control. The right choice depends on your requirements.
Best Practices
Test DR regardless of approach. DRaaS or self-built — test quarterly. A DR solution that hasn't been tested is a gamble.
Document everything. Runbooks, escalation paths, contact lists. When disaster strikes at 2am, you need clear instructions.
Start with DRaaS if unsure. It's easier to switch from DRaaS to self-built than the other way around.
Consider hybrid. Critical workloads self-built, standard workloads DRaaS. Optimize cost and protection.
Review annually. Your DR needs change as your infrastructure evolves. Review and adjust yearly.
Conclusion
DRaaS is the better choice for most mid-size enterprises: lower upfront cost, less operational burden, and faster deployment. Self-built DR makes sense for organizations with strict compliance requirements, existing infrastructure teams, or very large data volumes.
Don't let perfect be the enemy of good. A DRaaS solution tested quarterly is better than a self-built solution that nobody monitors. Start with what you can actually maintain, and upgrade over time.
Want to go deeper? Explore [Run infrastructure services](/en/products/run), [industry solutions](/en/solutions), or [contact our team](/en/contact).
FAQ
Q: Can I switch from DRaaS to self-built later?
A: Yes, but it requires planning. You'll need to migrate your DR data from the provider's cloud to your own infrastructure. Plan for 2-4 weeks of transition time.
Q: What RTO/RPO can DRaaS achieve?
A: Most DRaaS providers offer RPO 15-60 minutes and RTO 15-60 minutes. Some premium providers (Zerto) can achieve RPO under 5 minutes with continuous replication.
Q: Is DRaaS secure enough for regulated industries?
A: Yes, if you choose a provider with SOC 2, ISO 27001, and industry-specific certifications. Verify data encryption (at rest and in transit) and data residency options.
Q: How do I evaluate DRaaS providers?
A: Check: (1) SLA guarantees for RTO/RPO, (2) Compliance certifications, (3) Local data center presence, (4) Support quality and response time, (5) Integration with your existing infrastructure.
Industry Trends and Market Analysis
The market for this technology is growing at 15-25% annually, driven by digital transformation initiatives, remote work requirements, and increasing security concerns. According to Gartner, 75% of enterprises will have deployed this type of solution by 2026, up from 35% in 2023.
Key trends to watch: cloud-native architectures are becoming the default, AI/ML integration is moving from nice-to-have to essential, and zero-trust security models are replacing perimeter-based approaches. Organizations that delay adoption risk falling behind competitors who leverage these technologies.
Vendor Selection Criteria
When evaluating vendors, focus on five key criteria: technical capability (does it meet your functional requirements?), scalability (can it grow with your organization?), support quality (what is the SLA and response time?), total cost of ownership (not just purchase price), and ecosystem (partners, integrations, community).
We recommend creating a weighted scoring matrix with these criteria. Assign weights based on your priorities (e.g., if support is critical, give it 30% weight). Score each vendor on a 1-5 scale for each criterion. The vendor with the highest weighted score is usually the best fit.
Change Management and Adoption
Technology implementation is only 50% of the project. The other 50% is change management. People resist change, especially when it affects their daily workflows. Invest in communication, training, and support to ensure adoption.
Key change management steps: identify champions (early adopters who can advocate for the new solution), provide hands-on training (not just documentation), create feedback loops (regular check-ins with users), and celebrate wins (share success stories to build momentum).