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Size of Incremental Backups no Different from Full Backups for Virtual Machines

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It is noticed that the size of the incremental backups of (all) my Virtual Machines are no different from their full backups, and the time taken is equally long as well. Which setting(s) is likely to have gone wrong?

Using exactly the identical backup plan, the issue is not observed for physical nodes.

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Thank you! My case is explained by 65528: Acronis Cyber Protect Cloud, Acronis Cyber Backup: Why incremental backup looks like full backup. Now it brings me to wonder if the time taken for incremental backups of my VM nodes is reasonable. They sure are taking much more time compared to physical nodes, in the same network, as if a full backup is taking place. 

 Incremental Backup of a VM

image 437

Incremental Backup of a Physical node

image 438

"Backup options" I'm using for my VMs

Alerts - no

Backup consolidation - no

Backup file name - default

Backup format - automatic selection (option greyed out)

Backup validation - no

Changed block tracking (CBT) - no

Compression Level - normal 

Email notifications - use the system settings (default)

Error handling - default

Fast incremental/differential backup - Yes

File filters - not in use

LVM snapshotting - By the backup software

Multi-volume snapshot - Yes

Performance and backup window - default setting

image 440

Pre-post commands - no

Pre-post data capture commands - no

SAN hardware snapshots - no

Scheduling - Start all backups exactly as scheduled

Sector-by-sector backup - no

Splitting - Automatic

Tape management - default/not in use

Task failure handling - no

Task start conditions - Wait until the conditions from the schedule are met

Volume Shadow Copy Service (VSS) - Yes - Automatically select snapshot provider

Volume Shadow Copy Service (VSS) for virtual machines - Yes

Weekly backup - Monday (default)

Windows event log - Yes - Errors and warnings
 

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Kommentare: 2016

Hello Fang Cheng Tin

Besides the reasons listed in KB articles above, this could be due to the disabled Changed Block Tracked option or after defragmentation on the affected VM.