What's the task? Please describe

To avoid consuming too much computation and storage resources using default values, reduce BackupConcurrentLimit and RestoreConcurrentLimit default values. Users can adjust them on demand.

Describe the items of the task (DoD, definition of done) you'd like

Please use a task list for items on a separate line with a clickable checkbox https://docs.github.com/en/issues/tracking-your-work-with-issues/about-task-lists

• item 1

Additional context

Add any other context or screenshots about the task request here.