Do not confuse with Spectrum Protect.
Spectrum Protect Plus is a complete new appliance dedicated for VM backup. Based on opensource technologies, it's a backup software designed for simplifying the life of backup administrator.
3 components that can be installed together or on separate servers or VM:
Master server is based on Linux CentOS, with MongoDB. Vsnap server is using ZFS filesystem with compression and deduplication.
See also presentation on youtube