Thanks for all your good wishes. I am already working on the next stage - an alternative to groups.io where the groups we have already backed up can have their archives fully restored online. That project is expected to go live by February.
Basically, we have found a way of restoring our group archives into phpBB based forums - that is all messages, members and files are all available online again and the group can live on, on our new platform.
Here is a screenshot from our test group that will be the first to migrate to our new platform. That large group had lost everything due to inaction and our backups are resurrecting their group.
I am working with industry experts on this new project...
More details later ...