SUMMARY
This article explains that space allocated to IR cannot be used to storage backups.
ISSUE
No, once storage is allocated for instant recovery, it cannot be used for backups. This ensures the space is available any time you need it for instant recovery. If you do not allocate storage until after a VM fails, space might not be immediately available for instant recovery. In that situation, you can expand your appliance's storage and allocate the newly configured storage for instant recovery.