How to decommission a node and keep the data

Hi All

Just wondering if there is a way to decommission a node in Solarwinds NPM and the various sub modules and keep the data?

Ie

At the moment I want to decommission a device:

• Keep the device in a decommissioned state so I can see historical CPU usage, and config files

At the moment I have achieved this by changing the IP to a non routed IP and put it in an "unmanaged state" for 10 years in the future. to me though this is a bit of an ugly way to do it, as I need to keep historical information, and I will need to do the above for devices that have been replaced with new hardware as well.

Any help would be appreciated.

thanks