Disaster Recovery as a Service (DRaaS) is a managed service that keeps copies of your servers, applications and data and orchestrates bringing them back up on alternate infrastructure if your primary site or environment fails. The outcome you are buying is recovery: systems running again within agreed targets. How providers get there varies. A common model replicates servers continuously or frequently into the provider’s cloud or data center as ready-to-start replicas; others recover from backup copies, protect cloud-native workloads, or recover into your own cloud account. The provider typically supplies the tooling, the orchestration and often help with planning, testing and recovery, for a recurring fee instead of a second data center you build and maintain yourself.
At a glance
- DRaaS copies your systems and orchestrates their recovery on alternate infrastructure during an outage.
- Ready-to-start replicas in a provider-owned environment are a common model, but some services recover from backups or into your own cloud account.
- It is built around two targets you set per application: how much data you can lose (RPO) and how long you can be down (RTO).
- Testing is part of the service; how many tests are included, and whether the provider helps run them, varies.
- Recovery compute is often billed only when used, but pricing models differ by provider.
What problem it solves
When a data center, server room or core system fails, through hardware failure, a power or cooling outage, a fire or flood, or a cyberattack, restoring everything from backup can take days. Backups are designed to keep data safe; they are not designed to get dozens of servers and their networks running again quickly somewhere else.
The traditional answer was a second data center with standby hardware, kept in sync and tested regularly. That is expensive, and most of the capacity sits idle. DRaaS replaces it with a service: the provider supplies the copying, the recovery environment or the means to recover into one, and the orchestration, and in many models you pay for full recovery compute only when you need it.
How it works
Protecting the systems. Software on your hypervisor, servers, storage or cloud accounts copies your systems to a recovery location. Some services replicate changes continuously, which can keep the data-loss gap to seconds or minutes; others take scheduled snapshots or backups, which leave a bigger gap but usually cost less. The recovery location may be the provider’s cloud or data center, a public cloud region, or your own cloud account. Most services keep multiple recovery points so you can go back to before a problem started.
Runbooks. You define the order in which systems start, how they connect, which IP addresses and DNS records change, and how users reach them during a disaster. Some providers build and maintain these runbooks for you as a managed service.
Failover and failback. When you declare a disaster, the protected systems are started or restored in the recovery environment and take over; replicas can start quickly, while recovery from backup copies takes longer. Users connect through VPN, SD-WAN or public addresses, depending on the design. When your primary site is ready, the changes made during the outage are synchronized back and you return, a step called failback that deserves as much planning as failover.
Testing. Many services let you start copies of your servers in an isolated network to test without touching production. Regular tests show whether your RTO is realistic and expose missing dependencies such as licensing servers, identity services or firewall rules. Our DRaaS solutions page covers provider options.
When it matters for buyers
- When cyber insurance or customers ask for evidence. Insurers and enterprise customers increasingly ask how fast you can recover and when you last tested it.
- After an outage or a near miss. A failure that took longer to recover from than expected is a common trigger to formalize DR.
- When a second site is due for refresh. Replacing standby hardware is a good moment to compare it with a service.
- When ransomware is a top risk. Pair DRaaS with protected recovery points and an incident response plan, since you need to recover to a clean state.
- When moving to cloud or hybrid. Your DR approach needs to cover workloads wherever they now run, including SaaS data, which DRaaS for servers usually does not protect.
Questions to ask vendors
- What RPO and RTO can you commit to for our workloads, and are they in the contract?
- Which platforms do you support (VMware, Hyper-V, physical servers, cloud workloads)?
- How many recovery points do you keep, how far back, and are they protected from deletion or encryption?
- How many tests per year are included, and do you help run them?
- What do recovery compute, storage and network cost during a test and during a real disaster?
- How do users and sites connect to the recovery environment?
- Who does what during a disaster, and how fast will your team respond?
- How does failback work, and how long does it typically take for an environment our size?
How it differs from backup and Backup as a Service
Backup, including Backup as a Service, copies data to separate storage so you can restore it later. It is built for long retention, restoring individual files or mailboxes, and meeting record-keeping rules. Restoring an entire environment from backup on your own is possible but slow, because data has to be copied back, servers rebuilt and networks reconnected. DRaaS adds the recovery side: alternate infrastructure, orchestrated runbooks, testing and, in many services, ready-to-start replicas, so critical systems can run again within agreed targets, often minutes or hours depending on the service and design. Some DRaaS offerings are built on backup copies, so the line can blur; the test is whether the provider commits to and orchestrates recovering whole systems, not just restoring data. The two answer different questions: backup asks “can we get this data back?”, DRaaS asks “how fast can we be running again?”. Most companies need both, and broader data protection services may combine them.
Problems this helps with
- Not knowing how long we would be down if our data center or server room failed
- Backups we have never tried to restore at full scale
- Paying for a second site that sits idle
- Insurers and customers asking for a tested recovery plan
