The Differences Between Backup and Replication | Zerto

The Differences Between Backup and Replication

A-to-Zerto Glossary of Terms

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Overview

The terms backup and replication are often (and inaccurately) used interchangeably. There are advantages and disadvantages to both, and knowing the difference between these two technologies is critical for picking the solution that is right for your business.  

What Are Backup and Replication?

Both these terms are defined in more details in their respective articles, but at a high level here is what they are:

  • Backup involves making a copy or copies of data and storing them offsite in case the original is lost or damaged.
  • Replication is the act of copying data and then moving data between a company’s sites, whether those be datacenters, colocation facilities, public, or private clouds.

The Main Differences Between Backup and Replication

Choosing the technology that is best suited for your business can be challenging. Fortunately, we have summarized in the diagram below the main differences between backup and replication to explain some of the key distinctions.

Backup

Replication

DEFINITION

Involves making a copy or copies of data at specific points in time.



DEFINITION

Replication is the act of copying and then moving data between a company’s sites. It is typically measured in Recovery Time Objective (RTO) and Recovery Point Objective (RPO).

PURPOSE

Backup focuses on compliance and granular recovery, such as long-term archival of business records.



PURPOSE

Replication and recovery focus on Disaster Recovery – quick and easy resumption of operations after an outage or corruption. Minimizing the Recovery Time Objective (RTO) is key.

USES

Backup is typically used for everything in the enterprise, from production servers to desktops.



USES

Replication is often used for mission-critical

applications that must always be up and running.

HOW IT WORKS

Backup typically relies on snapshots which are copies of the data set taken at a pre-determined point-in-time.



HOW IT WORKS

Replication can be synchronous, asynchronous or near-synchronous and may use continuous data protection to enable users to access historic data.

REQUIREMENTS

Backup requires a tape library (usually VTL doing disk-to-disk backup) and some place to store archived tapes.



REQUIREMENTS

Replication requires investment in another

infrastructure in order to enable recovery and continued business operations.

BOTTOM LINE

Backup is a relatively inexpensive way to avoid complete data loss. Valuable for compliance. Does not ensure continuity of operations.



BOTTOM LINE

Replication is focused on ensuring that business applications and processes are always available, even after an outage. More expensive to set up and maintain.

4 Reasons Why Backup is Not Replication

Besides the differences noted above, there are specific reasons that make clear backup is definitely not the same as replication.

  • Service Levels. Backups typically occur once per day and at night, which means that the potential data loss could be days or more. When protecting the applications and data that matter to your business, this amount of data loss is unacceptable. Restoring from a backup, especially a tape backup, can take days; from disk it might be slightly faster – a few hours.
  • Application Impact. Backups rely on snapshot-based technology. The reason they are taken so infrequently is because this type of technology drains resources on the server. It is possible to take more frequent copies, but this comes at the expense of server resources and-user productivity is significantly impacted.
  • Reverse Protection. Once applications and data have been made available at a target site, protection must be extended to include the new data that users are creating. A backup solution will not start taking backups and ship them back to the production site. Replication technologies will replicate back to the source site, ensuring the application is still protected both during and after an outage.
  • Retention. Backups are normally stored for a very long time for compliance and audit purposes. Depending on how often they occur, the recovery granularity can be hours, days, or more. Technologies that use continuous data protection (CDP) offer extremely granular recovery points, often separated by mere seconds. This gives your enterprise several points in time to recover to, just in case the last point in time is corrupted.

Zerto for Backup and Replication

Backups are relatively inexpensive ways to maintain some level of protection. However, today’s digital consumers demand an always-on level of service that backups simply cannot provide. The Zerto Platform is changing the way companies think about protecting their data, providing a single platform for all your data protection needs. 

Zerto offers a newer, more advanced backup technology—called journaling technology—that lets you replicate data continuously and in real time, recording all your data every few seconds and giving you the lowest RPOs in the industry.

Zerto Platform Overview

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