This would be expected if extension data was completely wiped.
>
This is COMPLETELY UNACCEPTABLE
Agreed 100%.
> you better have an explanation
I've written up an extensive analysis here in response to your post. Hopefully it helps explain the situation and related challenges. Please let me know if you have any follow-up questions.
> redundancy and internal backups
We are investigating a local redundancy solution and making that our top priority. This sort of thing presents its own challenges and is not a silver bullet, but there is a relatively new technology available in newer versions of Chrome that appears to be a good fit for a relatively simple solution that could significantly mitigate data loss.