bug#33005: 27.0.50; Data loss with Gnus registry

[Michael Heerdegen]

Eric Abrahamsen <eric@ericabrahamsen.net> writes:

> I was going to say you could add a method to `eieio-persistent-save',
> maybe an :after method, and do it there, but now I wonder if you might
> get into some sort of recursive loop, since you'd want to use
> `eieio-persistent-save' in there, as well.

AFAIU that's not necessary or what I plan.  When `backup-buffer' creates
a backup for a file (named by buffer-file-name) it basically makes a
copy of the already existing file (and before any new contents are
saved) as newest backup.  Making a backup of the old version of the
registry save file is sufficient.

Michael.