On Sat, 26 Oct 2019 21:14:07 -0400, "Sarah Shapiro"
By that time I hope to have made progress on my own in copying my important group's files!
You can use PG Offline to do that. It takes a little setup but once
you do, it will automatically download files and the folders in your
files section, links, photos, and if you set it up right from the
start, the messages.
As of right now there is no facility to upload those messages to your
GIO group but that might be available shortly.