When booting from the Acronis recovery CD (Universal Restore) on a system with a RAID array, each physical RAID disk unit appears as a seperate disk when selecting the destination disk.
The recovery CD may not have the correct drivers for the RAID controller.
Ensure that the latest build of the Acronis recovery CD is used. You can download the latest build from here.
If the issue persists, follow the troubleshooting steps from the Kaseya Backup recovery guide and submit the details from the "Further investigation" section to Kaseya support for analysis.