PBS multiple bootable disks

Hi, I got a PBS server with 2x 3.8TB SSD with PBS installed as a RAIDZ1 and 12x 4TB HDD RAIDZ3 where the backups are saved.
I noticed that only one of the SSDs has boot and biosboot partitions, so I guess that if it breaks the other disk can't be booted. Is there a way to reinstall PBS so that both SSDs are bootable? Thanks in advance