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A snapshot, as the name implies, is a photograph of a virtual machine’s current moment. This snapshot is saved within the storage space of the physical host that contains the virtual machines. A snapshot consists of a copy of metadata and contains pointers used for a possible recovery in the event of a partial or total loss of the virtual machine.
A snapshot is nothing more than a signaled copy of a version of the current file that makes up the virtual machine with a flag version. Let’s think of it as follows:
According to the illustration, it is evident that with each snapshot taken, a copy of the same file is made with version control and possible incremental changes within that file, specifically regarding metadata.
The word backup in the technology world means a security copy of data from a storage device (tablet, cell phone, computers, and other storage media). Nowadays, there are several tools with solutions for working with backup from major manufacturers, some of which are listed below:
For a backup solution, we must always consider CDP (Continuous Data Protection), which encompasses two important indicators known as RPO (Recovery Point Objective) and RTO (Recovery Time Objective).
RPO (Recovery Point Objective) is the period between one backup and another — for example, a week, a day, or hours. RTO (Recovery Time Objective) is the recovery time for a backup — for example, when asking: “what is the restore time?” — that is the RTO.
Regarding CDP (Continuous Data Protection), we can explain it as a continuous backup planning to ensure data integrity in a structured and effective way.
Although many people understand the process between a snapshot and a backup to be the same thing, they do not serve the same purpose; that is, they are very different demands.
See the following table for a better way to simplify the differences:
In practice, backup is the resource that offers greater security, integrity, and efficacy for storage and recovery requirements. A snapshot, on the other hand, is a temporary backup strategy to assist in short-term recoveries.
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