What Is Backup and Recovery?
Backup and recovery refers to the practice of creating and storing copies of your data that you can use to restore your organisation’s services in the event of a primary data failure due to a power outage, ransomware attack, or other type of disaster. Backups allow you to roll back your systems to a previous point in time before the data loss or corruption occurred to restore services.
While you could store backups on the same server as the original data, it’s considered best practice to store them on a different server or separate system such as a secure cloud server to create data redundancy.
When considering backup and recovery solutions for your organisation, it's important to identify your recovery time objectives (RTOs) and recovery point objectives (RPOs). You’ll want to know how long it will take to restore backups and how recent the data will be.
Backups vs. Snapshots
The difference between these two terms is in the details. A backup generally refers to a complete copy of all the data and files in your system. Meanwhile, a snapshot copies the state of a system at a certain point in time.
What are Backups?
Backups are complete copies of your system files. The process of backing up these files can take anywhere from minutes to hours, depending on the amount of data you're dealing with and the type of backup you're performing.
They're designed for long-term storage and ideally should be kept somewhere other than your original server. That could be a separate hard drive or an entirely different server location.
Backups are a standard component of business continuity and disaster recovery (BCDR) plans.
What are Snapshots?
Snapshots preserve a virtual picture of your server's file system and settings at a specific moment in time. Unlike a backup which performs a full copy of your data, a snapshot only copies the settings and metadata needed to restore your data in the event of a disruption. It’s an important distinction because you will still need to store the source files for your snapshots in a separate location to be able to retrieve them.
When you restore your system with a snapshot, you revert it back to how it was the moment the snapshot was taken. Snapshots are ideal for short-term storage—often used for development and testing purposes. When space for your snapshots runs out, new snapshots will simply overwrite older ones.
Snapshots are handy when you want to perform a "quick save" of your system before installing a major update, for example. If you’re not happy with the results of the update, you can simply roll back to your last snapshot to restore your system to its previous state.
Full vs. Incremental vs. Differential Backups and Restoration
There are three basic ways to back up systems: full, incremental, and differential.
Each has benefits and tradeoffs, so it's essential to know how each one works before selecting one. You may even decide to use a combination of them.
- Full-image backup and restoration: This method creates a backup of all of your data to use as a restore point you can easily roll back to. Full backups arguably provide the best data protection, but they're also the most time-consuming. Organisations that use full-image backups don't usually do them on a daily basis because it would require a significant amount of disk space.
Restoration with full-image backups is fast, but the backup process to create them is time-consuming. As a result, your system data would likely have changed since you performed the last full backup. Any changes that occurred after the last full backup will not be restored. This method isn't ideal for organisations with shorter RTOs/RPOs.
- Incremental backup and restoration: This method backs up your data incrementally. It starts with a single full backup, then backs up only data that has been altered since the last backup.
The downside to incremental backups is that they can take a while to restore because restoration also occurs incrementally. To restore the data, you first have to implement the most recent full backup and then also apply each subsequent incremental backup to your RPO.
- Differential backup and restoration: Like incremental backups, differential backup also starts with a full backup and then subsequently only backs up data that has changed. Restoration is generally faster with this method. It requires two files: the previous full-image backup and the most recent differential backup.
Experience Modern Backup and Recovery with Pure Storage®
Big data is becoming bigger, faster, and multidimensional. The siloed nature of legacy data storage solutions is a major bottleneck for organisations trying to keep up with increasingly stringent RTO and RPO requirements.
Pure Storage solutions boast many data protection features that can help you reach your RTO and RPO goals. Key benefits include:
- Accelerated recovery for Tier 1 dev/test environments, analytics, IT sandboxes, and backups
- Faster database backups for Oracle Recovery Manager, Microsoft SQL Server, and MySQL
- Built-in protection against ransomware with SafeMode snapshots
- Zero RPO through synchronous replication across networks and zero RTO through transparent failover with Purity ActiveCluster™
Securing your organisation's critical data shouldn't be a hassle that distracts you from doing business. That’s why we designed our products to be as intuitive as they are reliable.
