Teamviewer Tech Helper wrote:
> Would it not be more prudent to at least start another SMG site at Groups.io for future postings and then use 
https://soc.genealogy.medieval.narkive.com
>   to view the past posts at least in the meantime until the dust settles.
> 
> Questions : Does the Usenet support exporting the posts or messages in MBox format or other formats?
Your Usenet client should save posts in Mbox format.  Mbox is basically 
a means of saving standard internet message format messages which is 
what Usenet starts at.
Note also pricing:  
https://groups.io/static/pricing
I'd guess SMG must be in the Tb range
> Just trying to suggest another option.
> 
> Robert
> 
Usenet is the original.  It has no reliance on a single provider. 
Although many here are moving to Eternal September it's not the only 
server available.  In the past I've used 
individual.net and currently 
simply use my ISP's reselling of GigiNews.
Google Groups was a latecomer and, as it has transpired, an early 
leaver.  If it were not for Usenet the future would be empty.  If it 
were not for Usenet it would have been what's called in the IT business, 
a single point of failure.  We determine such things by looking at them 
and asking "If that broke down would everything break?"
As I said, the reason Google wasn't a SPoF is because the link to Usenet 
was there.
So the test for any other option is just that: if it went the same way 
as GG would the whole thing disappear?
Neither Eternal September nor any other single Usenet server is a SPoF.
Just about any bulletin board, group service or social media site is a 
commercial reinvention of Usenet.  There have been enough of them which 
have come and gone to show that the single service provide is a single 
point of failure.
I see nothing about 
groups.io which suggests it wouldn't be but for 
those interested here's a useful link:
https://groups.io/hc/ownersmanual/Groups.io_Owners_Manual.pdf
Ian