I was able to use the snapshots within Synology,
Stopped Redrike+hassio synology package (Im using his package to run hass.io)
Stopped Docker
I then found the last good snapshot of my docker folder for hass.io
I restored and overwrote the current folder containing the deconz 6.11 which btw is located under /docker/hass.io/addons/data/core_deconz
(*where docker is the volume where I have the hass.io and other docker containers pointing to)
I then started docker
I went and stopped all hassio containers
I deleted all containers related to hassio
I then removed all images related to hassio
I started fredrike’s synology package - it did its part downloading and re-creating all the primary containers to run homeassistant
Once Home assistant was back up and running
I went into supervisor
I selected deconz
it showed I was originally running 5.3.6
I then went back to docker
downloaded homeassistant/addon_deconz 5.3.6
once downloaded, I mounted it
I named the container addon_core_deconz
I clicked on advance
I set its volume to the below path
/data = /docker/hass.io/addons/data/core_deconz
I did not start it
I went back to homeassistant UI and into supervisor
install VMM and run it as a VMDK - I ended up then copying my config over to the SAMBA share on the new install via vmm and viola! I have a future proof version running under VMM and supporting deconz 6.20 even