Tenable Nessus backup and restore

If you are using the Tenable Nessus product to run vulnerability assessments, you probably make a lot of tuning and configuring on policies
If you want to make sure that you do not lose all your work you have to backup a number of files.
A while ago I opened a case with Tenable support and was given a procedure to run
Here is what you need to do for backup :

1. Backup /opt/nessus on existing system

That's easy

Now to restore, you cannot simply restore all files because Nessus will complain about license violation and will get nowhere

So here is what I did:

1. go to Tenable portal and reset the Activation code
2. install Nessus software from package
3. Restore the following files from your backup (copy, do not move)
   
   in /opt/nessus/var/nessus, restore the following:
   
   /users folder
   policies.db
   Master.key
   Global.db                   --- could not find it on 6.8.* version
   global.db-wal
   global.db-shm
   
   in /opt/nessus/etc/nessus restore the following (these may be the only files in this directory):
   
   nessus-fetch.db
   nessusd.db
   nessusd.conf.imported
   nessusd.rules
4. Run the following commands:
   
   # /opt/nessus/sbin/nessuscli fetch --register YOURACTIVATIONCODE
   # /opt/nessus/sbin/nessusd –R
   #service nessusd start

I had to reboot the system after running /opt/nessus/sbin/nessusd –R as it seemed to never end