How can I find servers in my environment that aren't backed up?

One simple option is to just use Excel to manage and compare your lists.

If you’re using Veeam, it automatically notifies you about any servers that aren’t backed up. You might want to check with your backup vendor to see if they offer anything similar. It's really convenient!

You can also use Active Directory to query all the connected servers. Running a report on NetBackup and comparing the two lists can help you find servers that aren’t backed up. I did something similar using Veeam and it worked out well.

Another idea is to have your backup software run a script after each backup that appends server details like Name, IP, and time to a shared CSV file. You can then check this file to identify any servers missing from it. This is a really solid approach! I'm also considering implementing a check for backups to ensure none fail or rely on a second source for verification.

One option is to export a list of the servers that are currently backed up from NetBackup. You can then compare this list against the servers in Active Directory or wherever you manage your inventory to see what's missing.

I’m curious about what defines a server as being backed up? How would random software determine that? Since you're using NetBackup, shouldn't that be your authoritative source for this data? If you have a list of servers, checking against NetBackup should give you the answer.