As you might think, VM replication is a better implementation of the VM snapshot. With replications, there is no need to fear data corruption, complete loss of the original data, or reduced performance of the original VM, since unlike snapshots, they are kept in a different storage location and are only used in emergencies. However, since the design of replications (or replicas) requires them to reside in first tier data storage, there are significant cost factors to consider, depending on the size of the virtual infrastructure.
This means VM replication may not necessarily be the right concept for systems which do not require high availability.
In conclusion, if you want to back up data and virtual machines effectively, a backup solution is the method of choice. Snapshot technology scores points for maintenance work on short notice, and VM replication is the right method for optimal RTOs.
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