A replica contains uncompressed data ready for use. The advantage of using offsite replication is the short time needed to restore workloads with the data compared to restoring data from a backup. The VM replica is ready to power on and restore workloads if a primary VM fails. When replicating a virtual machine, we create a VM replica that is a VM clone of the primary VM on the secondary server located offsite. Offsite replication is the process of creating a point-in-time copy of data to use for failover and recovery of workloads in a short time. To achieve a shorter recovery time objective (RTO) you can use offsite data replication. Restoring from a backup requires time for extracting and copying the data from a backup to a server or virtual machine. However, if you use only offsite backups for disaster recovery, the recovery time can be too long for large amounts of data. A backup can be used to recover individual files. But this approach significantly increases the overall reliability of the data protection strategy. Restoring data from an offsite backup may take more time compared to an onsite backup. This is extremely important to consider when building a data center disaster recovery plan and a backup strategy. The 3-2-1 backup rule helps us diversify our backup sources so that we don’t have all of our recovery options relying on one source, medium, or backup location. This rule states that we should ideally have three copies of our data on two different mediums, and store one offsite copy of that backup data. The standard recommended by industry experts is the 3-2-1 backup rule. When planning for disaster recovery and protecting backup data, we always want to have more than one source of being able to restore our production systems. This operation can be part of an offsite disaster recovery plan. The offsite backup approach can be similarly implemented to back up data from a primary server to an offsite server located remotely. The two sites are distributed geographically to avoid data loss if a disaster affects the first site. Offsite backup is the copying of data from a production site to a secondary site located at a distance from the production site. The fundamental processes of offsite disaster recovery are offsite backup, offsite replication, and offsite data storage. While replication is more resource-intensive but allows you to restore workloads in a shorter time. With backups, you can save on storage requirements and other resources, which is also important when transferring data via a wide area network (WAN) or internet to a remote location. Storing backups and replicas away from the main environment is the foundation of offsite disaster recovery.
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