By Alison / Last Updated April 24, 2022

What is VMware incremental backup

Backup has become one of the most important tasks for any data administrator, especially for enterprises. VMware VMs, for example, have a large amount of critical business data that needs to be backed up regularly. Among VMware backup stratigies, incremental backup is a good choice because it saves both backup time and space.

How does incremental backup work?

Compared to full backup, incremental backup uses Changed Block Tracking (CBT) technology, and copies only the VM data that has changed since the last backup. Needless to say, it consumes less backup time and takes up less storage space.

When restoring, a large number of restore points allows you to restore the VM to any point in time you want. And features like VMware Consolidated Backup (VCB) enable you to consolidate full and incremental backups into a single backup file that can be restored as a whole. 

Full backup vs incremental backup vs differential backup
Backup Types Source Backup Files Backup Speed Space Taken Restore Restore Speed Frequency Restore Points
Full Backup Entire VM All VM files Low High Last full backup High Low Few
Differential Backup Last full backup Changes since last full Medium Medium-High Last full + last differential Medium Medium Medium
Incremental Backup Last full or incremental backup Changes since last backup High Low-High Last full + all incrementals Low High Many

How can you take incremental backup in VMware

VMware offers serveral backup methods to meet different data protection needs. Unfortunately, none of them can actually back up VMware VMs in incremental way.

You may think of snapshots, which preserves the current state of the VM and incrementally store the later changes to a delta disk. But first of all, it still depends on virtual machine's parent disk and cannot be used as an individual backup. Second, keeping snapshots for long time or just taking too many may affect the performance of your VMs.

At the same time, many third-party backup products on the market offer more reliable incremental backup options. You may even be confused by the technical terminology involved. So here I've briefly listed 4 types of incremental backups that you may see, namely, forever incremental backup, conventional incremental backup, forever forward incremental backup and reverse incremental backup.

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How to use AOMEI Cyber Backup for incremental backup

AOMEI Cyber Backup is a professional and reliable backup software that offers multiple backup scheme to solve your problem. It supports ESXi 6.0 to 7.0 and Windows Server 2012 and above. It can help you create a perfect incremental backup task.

  • Multiple backup types: Full backup, incremental backup, differential backup are provided. You can combine them according to your need.
  • Easy to use: Creating a backup task to protect important data only requires a few clicks which is very friendly to user.
  • Affordable cost: It is rather economical since it helps to save cost of storage and time and keep business data security.
  • Full compatibility: It supports VMware, vSphere, Microsoft Azure and Amazon Web Services (AWS).
  • Schedule backup tasks: It can automatically back up system and disk by setting a schedule, and restore VMs in a flash.
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Here, I will introduce the detailed steps on how to use this professional tool for incremental backup.

1. Download AOMEI Cyber Backup. Install and launch it.

2. To create wonderful backup tasks, you could navigate to Source Device and click VMware ESXi >> Add VMware ESXi. Enter IP address or device name, and type the User information including device username and password. Click Confirm.

Add VMware ESXi device

3. Bind your device to AOMEI Cyber Backup, and start creating your backup task.

4. In Backup Task page, click Create New Task to set up your backup plan.

☞ Task name: enter a backup task name.

☞ Backup Type: choose VMware ESXi Backup or Hyper-V Backup as you want.

ESXi backup

☞ Device Name: select the device and virtual machines you want to back up. Click OK.

select virtual machine

☞ Target: choose a location to store your backup files. You can choose a local path or a network path. Click OK.

Notes: If you choose to create a network path, you need to enter the path first and click the button on the right side to verify authentication which requires you to enter the user name and password of the network path, or you can try logging in anonymously.

select backup target

☞ Schedule: Click Enable Schedule to start scheduling your backup tasks. In Backup Method drop-down options, 3 backup method for you such as Full Backup, Incremental Backup, Differential Backup. In Schedule Type drop-down options, specify the backup time period such as daily, weekly, monthly (by week), monthly (by data).

Tips: Incremental backup only backs up the changed data compares to the last backup. If you need to delete one of the full backups or one of the incremental backups, all the associated backups after this one need to be deleted.

☞ Backup Cleanup: Set up the retention period for different backup types. When the period of backup files exceeds the setting data, AOMEI Cyber Backup will delete the older and useless backups automatically, and only keeps the newly ones. So, you don’t have to worry about wasting storage space, and it also contributes to the data security.

backup cleanup

 ☞ After setting up all information, click Start Backup to finish the process of scheduling incremental backups.

When enabling the backup task, you can check the status in the Backup Task screen, and edit the settings by clicking “…” on the right side of task.

How to choose a suitable VMware backup strategy

According to your own needs, such as recovery time objectives (RTO), restore point objectives (RPO), and risk tolerance, etc. Ask yourself what you need and how to choose a suitable VMware backup strategy?

For example, how much data can you tolerant to lose? A year’s data, a month, a week, a day, or an hour? If you perform weekly backups, the worst situation is that you could lost one week of data. Is it tolerable for enterprise? If not, then you may consider to perform daily backups, but the daily backup requires so much time and storage spaces, it may be low-efficient and expensive.

Especially for enterprise, it requires a high backup frequency. In order to maximum disk space utility and save costs, you can try AOMEI Cyber Backup.

Backup Frequency Backup Strategy
Monthly/Yearly or less Full backups
Weekly Full backups
Daily Weekly full backups + daily differential
Hourly Weekly full backups + daily differential + hourly incremental

Additional information for different types of incremental backup

To meet different demands, some of backup software develop various types of VMware incremental backup. In this section, I will introduce another 3 different types of VMware incremental backup.

Forever incremental backup

The forever incremental backup means to only perform one full backup at the beginning, and all subsequent backups are incremental.

As a result, the recovery progress can be extremely slow. To provide a valid restore image, the backup software first needs to take the full backup and apply all the changes saved in the incremental backups.

In addition, corruption of a single incremental backup file can lead to the failure of the entire subsequent backup chain, so there is a risk of data loss.

Forever forward incremental backup

The forever forward incremental backup means to set a retention policy, to merge the earliest incremental backup into the first full backup, whenever the number of the subsequent incremental backups exceed the number required by the retention policy.

The best feature of this way is that it saves disk space and backup-restore time. However, it can only maintain a fixed number of restore points. And if additional full backups are performed while forever forward incremental backup is enabled, it may reset the backup chain.

Reverse incremental backup

The reverse incremental backup means to create a full backup at the beginning, and all subsequent incremental backup will be merged into this full backup to keep it up-to-date, meanwhile the reverse incremental backup files will be saved as restore points for you to restore to previous state.

This offers a fast way to restore your VM to current state, but if you want to restore to an earlier restore point, you will lose the advantage of faster recovery. And incremental backups will still take up some disk space.

Summary

In this article, I introduced the detailed steps to achieve incremental backup using AOMEI Cyber Backup in VMware and also explains 3 different types of incremental backup for you.

A good backup tool can ensure your VM data security, improve work efficiency, and save costs on storage and time. If you also want to perform ESXi bare metal backup, this software is still helpful to solve your problem.