To control the efficiency of backup operations, you can change the number of parallel read operations that can be launched during AWS backups.
From the navigation pane, go to Protect > Virtualization.
The Virtual machines page appears.
On the VM groups tab, click the VM group.
The VM group page appears.
In the Settings area, click Edit.
The Edit settings dialog box appears.
Beside No. of readers, enter the number of readers you want to run in parallel during backups.