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What is disaster recovery? Disaster recovery is a set of tools, policies, tools, and processes that allow any company to restore and recover their important data after a natural or human-initiated disaster. Disaster recovery and disaster recovery solutions mainly focus on technology systems which are supporting key business functions and have a critical role in business continuity. It (disaster recovery) works to keep all important aspects of business smoothly functional even after the occurrence of considerable disruptive events. Due to such a key role disaster recovery is regarded as a subset of business continuity. In a situation where it becomes impossible to recover the primary site disaster recovery comes up with a process of data and services restoration in a secondary survived site which is also called the disaster recovery site. 

Disaster recovery site:

It's a place through which any company can relocate itself with all of its data, services, and everything after a natural disaster or security break. Basically, a disaster recovery site ensures that a company can be able to run its all operations smoothly until or unless it becomes secured to resume work from its usual location or new stable location. There are two available fundamental disaster recovery options: internal and external. These days mobile and cloud-based disaster recovery sites are gaining more and more popularity.                 

Key factors to consider while choosing a disaster recovery site:

These are a few things that any company should think about while selecting a disaster recovery site.                      

• Time slot 
• Price 
• Location 
• Required resources 

Prominent techniques used in disaster recovery:

Mostly disaster recovery solutions use these three techniques which are asynchronous replication, synchronous replication, and mixed techniques. Here is a brief and comprehensive description of all three techniques.   

Synchronous replication:

In this type systems and data are replicated both locally and on a secondary site. This technique ensures business continuity, a rapid restoration process with relatively low RPO (Regional Point Objective) and RTO (Regional Time Objective). This method has a geographical limit, if two sites have a mutual distance of more than 100km the synchronous couple becomes less functional and performance is compromised.           Asynchronous replication:

This technique of disaster recovery is far better and functional as compared to synchronous replication because it doesn't have any distance limit and protects your precious business data even in a situation of a large-scale disaster that damages both sites. The other advantage which this technique has is that it can be applied via software rather than using advanced and expensive storage technology.                                            Mixed technique:

Mixed technique not only enables us to reduce recovery time but is also effective to make sure that services are available even in the time of expanded disasters. It consists of replicating the system with synchronous technique on a close site and making a second replica at a distant location. From these techniques of disaster recovery, one can choose according to the specific needs of their company. However, the main objective of all of them is to save your data and make it available in the spot of disaster so that you continue your services without any interruption.                                                                                                        

Best Disaster recovery solutions:

DR backup and related technologies are the most essential part of any DR solution which enables any company to recover after facing disaster. Hence most aware companies rely on continuous backup processes to attain better recovery point objectives which are the amount of data loss calculated in hours or minutes by using machine or application snapshots for recovery before disruption. Here is a brief description of the best of the lot disaster solutions. Every DR solution from these is equipped with DR backup and all the other ingredients of a complete disaster solution.                                                        

N-able backup solution: This disaster recovery solution and backup operate by using an agent installed on physical or virtual servers. This DR backup also provides an archiving service for long-term data storage and offers granular control on archived data. Eventually, this archived data can assist in auditing, compliance demonstration, and other retention objectives. Moreover, this DR solution doesn't need to maintain a secondary data center because it stores and manages data in its private cloud with 30 data centers in four continents. These data centers are either ISO or SOC-compliant. Here are its other features. 

• It uses AES 256-bit data encryption to encrypt data when stored and transferred
• It offers custom encryption keys that are privately held by organization or MSP which means that even N-able backup itself can't make unencrypted your private stored data
• N-able backup allows you to maintain standby servers with uninterrupted restoration which is helpful to reduce downtime and to offer quick failover.
• It also allows replication of machines in a selected local data center or Microsoft Azure.

Microsoft Azure: Microsoft Azure provides Azure Backup and Azure Site Recovery which works to provide disaster backup and disaster recovery. Azure Site Recovery assists you in backup on-premises workloads to Azure and Azure workloads to various available zones. In a situation of a disaster, companies can readily replicate on-premises workloads on Azure and perform failback procedures when the primary data centers are recovered.  

• Azure Site Recovery feature also helps to perform disaster recovery drills without interrupting an ongoing replication process and it also allows running failovers for expected or unexpected disruption without losing any bit of data.  
• Azure backup allows companies to back up their data files on different databases managed through Azure VMs.
• It provides data storage redundancy at all levels, from local level to zone level and performs application-consistent backups which contain all the data required for application restoration.

Barracuda Backup: This disaster recovery solution is able to backup data from a diversified source range which includes physical, SaaS application sources and virtual machines such as OneDrive, SharePoint, and SQL databases. Moreover, it offers the following solutions regarding disaster recovery.

• Barracuda Backup Appliance is a physical tool for backups 
• Its Cloud to Cloud feature helps in managing Microsoft 365 backups
• Barracuda Virtual backup can be used directly in the hardware of any company. 
• Complete cloud-based management from only one console

Other notable disaster solutions are: 

• N-central solution and N-able solution 
• Tier Point 
• Flexential DRaaS