For Z-Wave you have to add/remove each device at the panel. Remove all at the panel just removes all connected Z-Wave devices from panel programming but the network info is still stored on each device. Unfortunately, that info cannot be backed up and restored.
You can request a backup of sensor settings and users at any time. Just let us know.
When you get the new panel, dont use the System Manager to swap (it doesnt work with backup/restore) just let us know and we will get started. Additionally, don’t learn anything into the new panel prior to the backup restore as this can cause the restoral to fail.
While this guide is for going from Gen 1 to IQ panel 2, the process is largely the same.