Incremental backups too large when backing up multiple disks at the same time

when backing up two or more disks using Schedule Volumes, incremental backups are much larger than expected (for example, around 90% of the size of the full backup)
if each disk is backed up individually, the incremental backups are expected size (typically around 5-10% of full backup size)

Two or more Windows volumes have identical serial numbers. This can be seen using "dir" command, for example: -

Volume in drive C is OS
Volume Serial Number is 4894-FFFC

Volume in drive D is OS
Volume Serial Number is 4894-FFFC

The problem must be corrected on the Windows side.

For example, VolumeID tool from Sysinternals can be used to reset serial numbers - https://technet.microsoft.com/en-us/sysinternals/bb897436.aspx

Kaseya VSA (Backup module) - all versions

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