Are talking about open source only? Because there are loads of options available. Veritas has two products (netbackup and backupexec). There is also commvault, veeam, ibm spectrum protect and hp data protector. Admittedly only netbackup and commvault are what I would truly call enterprise, but your options are certainly not limited.
As someone who used to administer an ADSM server back a long time ago -- I'm curious what the gap between spectrum protect or whatever it's called now and commvault/netbackup? I've haven't really looked at that space for at least a decade.
