Reverse Incremental Backup – What is it?
With the proof of concepts and development of new technology; comes new ways to do things that may go against the ‘traditional’ style of things. In the backup and restore world; one of these things is the reverse incremental backup.
Traditional Backup Methods
Back in the late 90’s and early 2000’s; well before Bieber, Facebook and Netflix – businesses still needed to back up their data. A lot of it was to localised media, or manually rotated offsite (such as tape and external hard drives).
Data was just starting to grow larger and larger; transfer speeds weren’t as they are today which meant that backup windows were being pushed to the boundaries.
Luckily there were some methods to help reduce the strain; while also reducing the amount of data actually included in the backup.
As the name alludes to; a full backup is a backup of the entire data set in one go. While full backups provide the best protection, they take quite some time to complete and use a lot of physical storage.
A differential backup bases itself off the last full backup. If a file has changed since the last full backup; then it’ll be included in each differential backup.
The advantages of a differential backup include shorter restore times as you’re only requiring two backup files in the backup chain to perform the restore (the full and differential files).
One of the downsides to differential backups is that they can grow in size if a full backup hasn’t been performed regularly.
An incremental backup is the fastest way to back up data. Anything that has changed since the last backup (unlike a differential above, which is anything that has changed from the last full backup).
While the backup is very quick, the downside comes on the restore side. To be able to restore files from an incremental backup; you need every file in the backup chain. If there is one full backup, and nine incremental backups, to restore from the last backup you’ll need to have all 10 files available.
Also, if any of the files are corrupted or damaged – any backup taken after that point isn’t usable as the backup chain is broken.
Now onto the Reverse Incremental Backup…
Now that we’ve covered the traditional methods of backup; we can go further into the reverse incremental backup.
Reverse incremental backup is as it implies – it’s the reverse of a standard (or forward) incremental backup. What this means is that the latest backup is always the full backup, while any historical backups are just storing any of the changes that occurred. Solutions such as Veeam, Zetta and Intronis are well known to use the reverse incremental backup method.
Is backup jargon not your thing?
While it’s easy to get caught up in all the different possibilities with backup these days; we know it’s not for everyone. Are you a business owner that is struggling to get a grip on your backups? Or a Managed Services IT Provider that would rather focus on the glamorous side of IT? We’re able to help!
Test My Backups have years of experience, working with a number of businesses in a variety of industries. Outline the backup and restore problems you have to us directly; and we’ll be able to let you know how we can help with no obligation to move forward.