In order to keep our environment safe SolarWinds, plus database, we need to keep the backup server to ensure all customizations that ran on the system?
Apologies - was the question what all needed to be backed up? Generally the DB is sufficient. Here's a quick tutorial: Video Tutorial: Backup Databases for Orion NPM - Videos | SolarWinds
if you are running NCM there is more that has to be backed up (specifically the devicetemplates directory) plus any exported configurations
NPM needs the reports directory as well.