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Disaster Recovery / DRaaS

Native Disaster Recovery in HC3Native Disaster Recovery in HC3

HC3 replication, snapshot, and cloning technologies combine to provide a full set of backup and recovery capabilities to make sure you data is always protected. Scheduling, retention, recovery, failover, failback, and DR testing are all part of HC3 at no additional cost.

Continuous Per-VM Replication:

HC3 makes use of its space efficient snapshot technology to replicate to a secondary site, tracking and sending only the changed blocks.

Low RPO/RTO and Flexible Scheduling:

Continuously replicate as often as every 5 minutes and failover within minutes while tailoring replication schedules per VM.

Simple Disaster Recovery Testing:

Testing a DR infrastructure plan is now as simple as cloning a snapshot on the target cluster and starting a VM. No disruption to ongoing replication.

Easy Failback after Disaster Recovery:

After running a VM at the DR site, simply replicate the changed data back to the primary site for simple failback.

HC3 Cloud Unity DRaaS

For organizations that either lack a remote site for disaster recovery or would simply prefer not to deploy their own disaster recovery site, Scale Computing offers HC3 Cloud Unity DRaaS. This disaster recovery as a service offering provides an HC3 DR target running securely in Google Cloud Platform. Workloads can be replicated to the Google cloud for failover or recovery on a per VM basis. Your HC3 on-prem system is already acting as a private cloud so cloud-based disaster recovery fits perfectly.

As a service, this option allows predictable pricing that can protect anywhere from a single VM to any number of VMs on HC3 clusters. This service uses the built-in snapshot and replication features that can provide RPO and RTO measured in minutes. There is no VPN required for connectivity. HC3 Cloud Unity DRaaS uses L2 networking to provide seamless connectivity between on-prem and remote hosted VMs in the event of failover.

HC3 Cloud Unity DRaaS includes award-winning ScaleCare support at every stage to assist in setup, testing, failover, and recovery. The service also comes with a runbook to assist with both planning and execution. When needed, all protected VMs can be failed over and running in the cloud and then failed back once the on-prem resources are restored.

Whether an organization does not have a second site or would rather not manage one, DRaaS is a perfect fit. The combination of predictable cost and reliable recovery will provide piece of mind for business continuity. Click here for more information on HC3 Cloud Unity DRaaS.

HC3 Cloud Unity

Simple Backup, Replication, Failover, and Recovery


The concept of backup has evolved over the decades to overlap with more modern snapshot and replication technologies. The days of taking traditional full and incremental backups should be over. With HC3, anyone can implement a simple, yet robust disaster recovery strategy that combines per VM snapshot scheduling with replication, failover, and recovery. Each HC3 appliance has built-in VM snapshots with scheduling capabilities that are flexible enough to implement almost any backup strategy.

Like traditional incremental backups, snapshots only capture data that has changed since the last snapshot, making them highly efficient for storage and enable flexible scheduling. Different workloads will have different requirements for disaster recovery. It is important to know what level of protection each workload in your organization needs. Often, workloads are divided between tiers of priority, recognizing some as more critical to operations than others. Backup strategy should reflect these multiple levels of need.


Snapshot Increments Minutes Hours Days Weeks Months
Strategy 1 Critical Every 5 mins for 12 hours Every hour for 36 hours Every day for 4 weeks Every week for 6 months Every month for 2 years
Strategy 2 Non-Critical N/A Every hour for 1 day Every week for 2 months Every week for 2 months N/A

A user’s backup strategy will impact available disk space so the number of snapshots per VM may need to be managed based on overall storage availability on an appliance. Snapshot size will vary depending on the data rate of change per VM.

Snapshots alone do not make a backup, even though they are extremely useful for local recovery of data from a number of operational disasters. For a true backup strategy, snapshots must be replicated onto another device, preferably at another site.


HC3 native replication capabilities will replicate snapshots on a per VM basis to another HC3 appliance or cluster using efficient network compression and encryption. The replication process begins with an entire replica of the VM and its snapshots. That replica can be used on the target HC3 appliance for full recovery or failover. Replication follows the snapshot schedule assigned to a VM and can replicate snapshots as often as every 5 minutes for a solid RPO.

Replication occurs over standard TCP/IP networks so it can travel over any distance to any remote site. Replication is not synchronous so it does not require high speed links that are expensive and restrict replication within campus or metropolitan areas. Low bandwidth and latency can affect replication performance. It is important to understand the amount of data changing on a VM that may be replicated over the available bandwidth. WAN acceleration technologies can be used with HC3 to help overcome some bandwidth and latency challenges between remote sites.

Replication can be directed to another HC3 appliance locally or remotely although remote replication is recommended to protect against site failure. Snapshots are maintained locally on the original appliance based on the snapshot schedule for retention, whether they are replicated or not. Local snapshots can often protect against individual file loss or corruption. Replication is what creates the full backup for protection against appliance or site failure.



When an HC3 appliance experiences a critical failure event that cannot be recovered quickly, such as a fire, flood, or sustained power outage, replicated VMs can be failed over to the appliance where the replicas reside. The failover process is simple, consisting of creating a clone from the replica, powering on the clone, and in most cases between sites, redirecting DNS for the IP address and subnet at the remote site. This process can be completed very quickly, in a matter of minutes after failure, providing a very solid RTO.

It is important to understand dependencies between workloads and create a plan or runbook for failing over. Some workloads may need to start before others to ensure applications can connect to required data and services for startup. Some of the process, such as DNS redirection may also be automated with scripting. The larger the number of workloads, the longer the overall process may take, but with proper planning, it should all be manageable in minutes rather than hours.

After failover, the failover VM will have the most current version of the data as it is now in production. Although the failover VM could become the new permanent production VM, most likely it will be relocated back to the original site once the appliance is recovered/replaced. If the original VM is intact but now outdated, as is often the case, data can be restored quickly with HC3 replication identifying the last good data point and only needing to restore the changed data. Then the failover process can be reversed, quickly bringing the workload online at the original site. If the original VM no longer exists, it will just require a bit more time and effort to restore all the data.



While failover is also considered recovery of an entire VM, there are cases where it is neither desirable nor practical to failover a VM. An individual file on a file server may need to be recovered rather than an entire VM. Maybe it is a non-essential VM that is not required to be running during a failover scenario but rather only recovered back to the original site as time permits. In these cases, the data can indeed be recovered either on an individual file basis or as an entire VM.

For individual file recovery, we have outlined this process which is similar to failover but does not bring the replica VM into production or redirect users to it. It merely creates a bootable version of the VM to recover files that reside therein. Like failover, the process can be completed very quickly in a matter of minutes.

Individual recovery may also be implemented on individual Windows VMs by enabling the Virtual Shadow Copy Service (VSS) within the Windows guest OS. VSS within the Windows VM can provide powerful point-in-time file recovery that is available to individual users if desired. These snapshots will affect the storage requirements of the VM but that is simply the tradeoff for quick, easy file recovery for users.

For whole VM recovery, it is just a matter of redirecting replication back to the original site as if you were restoring after a failover but without ever having failed over. You do need to clone the replica but this takes seconds and then you may begin restoring the VM back to the source site. This is a perfect scenario for non-essential VMs that are not needed online during disaster recovery scrambles.

These built-in recovery techniques, along with replication and failover can provide a complete disaster recovery solution for HC3 that should meet the needs of many organizations. In the past, it was a common requirement to purchase and license a third party solution for every IT infrastructure environment. Now, with features that are built-in to HC3, most disaster recovery needs are met without reliance on additional solutions.

ROBO and Small Environments

Not all organizations look the same nor have the same disaster recovery requirements. It is important to call out some specific types of environments with unique needs. Distributed enterprises with multiple remote offices or branch offices (ROBO) and other small IT environments can be challenged to provide disaster recovery with very limited resources. HC3 addresses these configurations with a single node appliance configuration.

The Distributed Enterprise

In the distribute enterprise, there is typically a healthy IT infrastructure at a central office and then multiple remote or branch offices with minimal IT footprint. In this environment, the HC3 single node appliance configuration provides a simple, easy to manage virtualization platform without the high availability of a cluster, but with replication and failover capabilities for disaster recovery. For these sites, a full cluster is overkill so the single node appliance makes sense from a cost and resourcing standpoint. Many of the critical workloads in these environments are already protected by high availability and replication within the central office, so the remote site does not need the same level of availability.

Each single node appliance in the remote offices can be managed remotely and replicated back to an HC3 cluster at the central office for backup, failover, and recovery. When one of these appliances fails, the workloads can be failed over to the central office. The failed over workloads can then be accessed remotely until the node can be recovered or replaced. It provides a right sized configuration and price while providing built-in disaster recovery.

Distributed Enterprise

Small Environments

Smaller environments benefit from a smaller HC3 cluster in production for local high availability. However, in the event of a site disaster they can probably weather the storm running their critical workloads on a single node appliance until the primary site is recovered. For these smaller organizations, it may not make sense financially or practically to deploy a whole second cluster for disaster recovery, even when they have a second site to host it.

By only protecting the critical workloads that will allow their business continuity after disaster, these smaller organizations can avoid downtime by failing over to a single node. Non-essential workloads may not need to be backed up at all on these systems or simply backed up to storage without failover. As soon as they recover or replace their primary cluster, they can failback and return to normal operation.

Small Environments

A single node appliance can be an ideal configuration for disaster recovery in both distributed enterprises and small environments to meet both disaster recovery needs and costs.

Third Party Options

Built-in disaster recovery features provide a complete and effective backup, failover, and recovery strategy for most organizations, but some organizations require more specialized disaster recovery. Whether because of specialized workloads or specific compliance needs, some organizations may choose to deploy agent-based backup agents on individual VM workloads.

HC3 supports any in-guest backup agents that are designed to run on Intel-based virtual machines on our supported OS platforms. These backup agents generally interact with the application directly. These solutions create specialized backups for various recovery scenarios or are more specialized in creating system state backups for recovery between hardware and virtualization platforms.

If a disaster recovery strategy involves failing over or recovering VM workloads to a platform other than HC3, a third party agent-based solution is required. Examples of third party agent-based solutions include Symantec Backup Exec, Unitrends Enterprise Backup, Acronis True Image, and many others.

For workloads that require a more aggressive level of RPO and RTO down to seconds rather than minutes, there are third party agent-based replication solutions like Double-Take Availability. These solutions provide automatic failover for maximum RPO and RTO over any geographical distance. This option is for highly critical workloads where nearly any data loss or downtime, even minutes worth, is unacceptable.

There are many third party options that may be used with HC3 and these may all be considered as part of a disaster recovery strategy in addition to the built-in HC3 features. Scale Computing is committed to providing the best, most complete infrastructure solution in the market and that includes complete disaster recovery.