Guide ยท 28 October 2026
What is Disaster Recovery as a Service (DRaaS)? A plain-English guide
Disaster recovery as a service (DRaaS) is a subscription service in which a provider keeps copies of your critical servers ready to run in a separate recovery environment, usually in the cloud. If your office, server room or main system goes down, those servers are started there, so your business keeps working while the original is repaired.
This guide explains how DRaaS works, how it differs from backup, what the jargon means, what it costs and how to decide whether your business needs it.
Key takeaways
- What it is: a service that keeps your critical servers ready to run somewhere else when your own systems are down.
- Versus backup: backup gets your data back after you rebuild. DRaaS keeps the business running in the meantime.
- The two numbers: RTO (how long you can be down) and RPO (how much recent work you can lose) drive the design and the price.
- Not for everyone: if your business can wait several days, well-tested backup may be enough. Time a restore before you decide.
- Watch the extras: failover computing, data transfer, drills and failback are the costs that surprise buyers.
What is DRaaS, in plain English?
Think of DRaaS as a fully equipped spare office that a provider keeps ready for your servers. Every day, copies of your important systems are sent there. If your own site is knocked out by a server failure, ransomware, a power cut, a fire or a flood, the copies are switched on and your staff carry on working from them.
The "as a service" part matters. The provider buys, runs and supports the recovery infrastructure, so you do not have to build a second server room or pay for hardware that sits idle. You pay a subscription or a usage-based fee instead. That is why DRaaS is now realistic for small and mid-size businesses, not just large enterprises.
Two details are easy to miss. DRaaS usually covers the servers and systems you choose, not everything you own. And the plan is more than technology: it also covers who decides to fail over, who does the work and how you return to normal afterwards. Those details belong in your agreement and should be practised before you need them. You can read how we approach this on our disaster recovery (DRaaS) service page.
How does DRaaS work?
Every DRaaS plan follows the same three stages, whatever the vendor calls them.
Replication is done by software agents or virtual appliances that copy the servers you choose. Copying continuously keeps the recovery site closer to current, but it uses more bandwidth than copying on a schedule.
Failover is handled by orchestration tools or a written runbook that starts the recovery servers in the right order and moves users across. Ask who presses the button. In some plans failover is automatic. In others, a person at the provider or at your business has to declare the disaster first.
Failback is the careful reverse: once your own site is repaired and verified, whatever changed at the recovery site is synchronized back before staff move home. It is the stage most often left out of the sales conversation.
What is the difference between backup and disaster recovery?
Backup and DRaaS answer different questions. A backup asks: do we still have a copy of our data? DRaaS asks: where does the business run while its own systems are down? Most businesses need backup. DRaaS is for the systems you cannot be without for long.
| Question | Backup | DRaaS |
|---|---|---|
| Main purpose | Restore data or systems from a protected copy | Keep critical workloads running during an outage |
| Where systems run during an outage | Nowhere until your hardware is repaired or replaced | In the recovery environment, until you fail back |
| How long recovery takes | Depends on what has to be rebuilt, often hours to days | Targeted by the RTO in your agreement |
| Typical events | Deleted files, a failed disk, a single damaged system | Server failure, ransomware on servers, a site outage, fire or flood |
| Scope | Files, application data or single systems | Whole critical systems, plus the network and access they need |
| Cost | Mostly storage | Higher, because standby capacity is held ready |
| Testing | Restore tests of selected data or systems | Scheduled failover drills of the whole recovery path |
You usually need both. Backups give you granular restores, such as one deleted folder or last week's version of a file, and longer retention. DRaaS keeps the critical systems running when a whole server or site is lost. For a deeper look at the backup side, read backup vs. recovery: what businesses need to plan for.
RTO and RPO: the two numbers behind every DRaaS plan
Before a provider can design anything, you need to answer two questions for each system. How long can this be down? How much recent work can we afford to lose or re-enter? The answers are your recovery time objective (RTO) and recovery point objective (RPO).
Different systems deserve different targets. Your accounting server and a rarely used file share do not need the same protection, and giving them the same target wastes money. A simple business impact review ranks systems by revenue, compliance and customer impact, then assigns tighter targets only where they pay for themselves. Our guide to RTO and RPO shows how to set them.
Remember that these are planning targets, not promises. The real result depends on the incident, the environment and the scope you have agreed.
Hot, warm and cold: how ready is the recovery site?
Providers describe standby levels as hot, warm or cold. The readier the site, the faster it can take over, and the more it costs.
| Level | What it means | Recovery speed | Cost | Typical fit |
|---|---|---|---|---|
| Hot | Recovery servers are running or ready to start at once, with data kept closely in sync | Fastest | Highest | Systems the business cannot do without |
| Warm | The environment is set up and data is copied across, but servers are started when needed | In between | In between | Important systems that can wait a short time |
| Cold | Data is stored safely and the environment is built or powered up on demand | Slowest of the three | Lowest | Systems that can wait longer |
A sensible plan mixes levels: faster tiers for the few systems that need them and lower tiers for the rest.
Three ways DRaaS is delivered
| Model | Who does the work | Suits | Cost |
|---|---|---|---|
| Managed | The provider runs the whole process, from replication to failover | Businesses without a dedicated IT team | Highest |
| Assisted (co-managed) | You and the provider split the work, and the provider takes the most complex or time-critical steps | Teams with some IT capacity | In between |
| Self-service | You plan, test and run recovery yourself on the vendor's platform | Teams with skilled in-house IT | Lowest upfront |
Cheaper plans usually put more responsibility on you. Decide honestly who will be at the keyboard when the disaster happens, including outside office hours.
What does DRaaS cost?
We will not quote a one-size-fits-all DRaaS price, because any single figure would mislead. The cost depends on what you protect and how fast you need it back. Providers price in different ways: a flat subscription, pay-per-use, a fee per protected server, or a protection fee plus separate charges for storage, transactions and data transfer.
| What changes the price | Why |
|---|---|
| Servers and applications protected | More workloads mean more replication and more to start at failover |
| Data volume and rate of change | Large or busy data sets need more storage, bandwidth and retention |
| RTO and RPO targets | Tighter targets need more frequent copying and more standby capacity |
| Hot, warm or cold standby | Faster readiness costs more |
| Testing and drills | Regular tests take time and temporary computing capacity |
| Management level | Fully managed costs more, self-service costs less but needs your own skills |
Costs that surprise buyers
- Failover computing: running your servers at the recovery site can be billed separately while you are in a disaster.
- Data transfer out: pulling data back out of a cloud environment can carry its own charge.
- Failover tests: some providers bill drills separately or limit how many you get.
- Failback: returning to your own site may cost extra, so confirm who does it.
- Storage growth: your data grows, and so does the bill.
Compare quotes on the same assumptions: the same servers, the same RTO and RPO and the same test schedule. Otherwise a cheap quote may simply be a smaller promise.
Does DRaaS protect against ransomware?
Only partly, and only if the plan is designed for it. DRaaS copies your systems to a second place, but if ransomware has already encrypted a server, a copy made after the infection can be encrypted too. What saves you is having earlier recovery points that attackers could not alter, kept apart from your everyday admin logins, and a clear process for deciding which point is clean.
Ask providers about immutable (unchangeable) copies and how they identify a safe restore point. It is the same logic we describe in our PHP2Shell guide: patching closes the door, but a clean copy is how you recover. And whichever tool you use, prove it works with a timed restore test.
Do you need DRaaS? A quick decision path
DRaaS is not for every business. If you can work without your main systems for several days, well-tested backup may be all you need. The honest test is a timed restore: if you have never measured how long a full recovery takes, you cannot say what you need.
DRaaS is usually worth a look if:
- a day without your main server would cost real revenue or client trust;
- your critical systems run on one or two servers in a single office;
- you have backups, but have never tested how long a full recovery takes; or
- clients, insurers or regulators ask about your recovery plan.
Not sure which side you fall on? Our free recovery readiness check is a short questionnaire that scores what is protected today and where the gaps are.
DRaaS and Canadian data: does the recovery site have to be in Canada?
Not by law in most private-sector cases, but it is not a question to skip. PIPEDA, the federal private-sector privacy law that applies to most Ontario businesses, does not by itself require personal information to stay in Canada. It does keep your business accountable for that information wherever it is processed, including by a DRaaS provider and its subcontractors.
The Privacy Commissioner's guidance on processing personal data across borders points to three practical steps:
- Put the protections in the contract, aiming for a level of protection comparable to what the data has at your own site.
- Be open with customers that their information may be processed in another country and could be accessible to that country's authorities.
- Think harder about sensitive data. A contract cannot override another country's laws.
Some customers go further. Financial services, healthcare and public-sector buyers often require Canadian data residency in their own procurement rules, even where the law does not. Quebec's Law 25 adds extra assessment and disclosure duties for transfers, and British Columbia and Alberta have their own private-sector privacy laws. A Canadian data centre also does not automatically put data beyond foreign legal reach if the provider is headquartered abroad.
So ask where the recovery environment and its subprocessors actually sit, and get the answer in writing. This is general information, not legal advice. Confirm your own position with a privacy lawyer.
Questions to ask any DRaaS provider
- Which of our systems are in scope, and which are not?
- What RTO and RPO are written into the agreement for each system?
- Where does the recovery environment sit, and who are the subcontractors?
- Who decides to fail over, and who does the work? Is anything automatic?
- How often is failover tested, are tests included in the price, and do we see the results?
- What will failover computing, data transfer and failback cost during a real event?
- How are recovery copies protected from ransomware, and how do we choose a clean restore point?
- How do we return to our own site afterwards, and who is responsible?
- What happens to our data and our recovery plan if we leave?
We have helped businesses whose previous provider's backups looked healthy but did not restore reliably when it counted. A confident answer to question 5 is the best early sign that a provider tests what it sells.
Frequently asked questions
What is disaster recovery as a service (DRaaS)?
DRaaS is a subscription service that keeps your critical servers ready to run in a separate recovery environment, usually in the cloud. If your main site or system goes down, those servers are started there so the business can keep working while the original is repaired.
What is the difference between backup and DRaaS?
A backup is a protected copy of your data that you restore from after something fails. DRaaS keeps critical systems running in a recovery environment while your own systems are down. Most businesses need backup, and DRaaS is added for the systems they cannot be without for long.
How does DRaaS work?
DRaaS has three stages. Your chosen servers and data are replicated to a recovery environment, either on a schedule or continuously. If the main site goes down, you fail over by starting the recovery copies and pointing staff to them. When the main site is repaired, you fail back by copying the changes home.
What do RTO and RPO mean?
RTO, the recovery time objective, is how long a system can be down before the impact is unacceptable. RPO, the recovery point objective, is how much recent data you can afford to lose. Both are targets you agree for each system, not guarantees.
How much does DRaaS cost?
It depends on how many servers you protect, how much data changes, how tight your RTO and RPO are, how ready the standby site is and how much of the work the provider manages. Ask about extra charges for failover computing, data transfer, tests and failback before you compare quotes.
Is DRaaS worth it for a small business?
It depends on how long the business can work without its critical systems. If a day without the main server would cause real loss, DRaaS is worth evaluating. If systems can be down for several days, well-tested backup may be enough.
Does DRaaS protect against ransomware?
Only if the plan is built for it. Replication can copy encrypted data to the recovery site, so you also need earlier recovery points that attackers cannot alter and a way to pick a clean one. Ask any provider how they handle this.
Does my disaster recovery site have to be in Canada?
Not by law in most private-sector cases. PIPEDA does not require personal information to stay in Canada, but your business stays accountable for it wherever it is processed. Some customers, sectors and provinces add stricter rules, so ask providers where the recovery environment sits and confirm your position with a privacy lawyer.
Does DRaaS guarantee my business will never go down?
No. Disaster recovery planning sets an agreed recovery approach, but it does not guarantee uninterrupted operations or a specific outcome in every situation.
Want to know where your business stands?
We help small and mid-size businesses in Ontario, across Canada and in the United States decide what really needs to keep running, and what it would take to get it back. We start with your systems and your numbers, not a product. You can read about our disaster recovery service first, or talk to us directly.
- Recovery readiness check: a short questionnaire that scores what is protected today and where the gaps are.
- Backup and restore testing: we prove backups by restoring them and timing the result, not by reading a green tick.
- Disaster recovery planning: we map your systems to RTO and RPO targets and agree the recovery approach and scope with you.
Sources
- TechTarget: What is disaster recovery as a service (DRaaS)?
- Otava: DRaaS pricing, what it costs and what impacts it
- N-able: DRaaS for small business
- NAKIVO: Disaster recovery vs. backup, key differences
- Office of the Privacy Commissioner of Canada: Guidelines for processing personal data across borders
- StackHarbor: PIPEDA and data residency
This article reflects public information as of 28 October 2026 and is general guidance, not legal advice. What a DRaaS service includes, and who runs failover, is always defined in your own agreement.