[Spce-user] A/B upgrade schema, how to keep custom installed software

[Henk]

Hi all,

I just upgraded to mr9.5.4 and noticed that the A/B upgrade schema takes 
a lot of extra work to reinstall all software that disappears when 
upgrading. For example I'm using letsencrypt; fail2ban and ipset 
(ipset-blacklist), which is very useful to block unwanted scanners.

Is there an easy way to keep those extra programs?

Also it would be nice to have some documentation on how to rollback the 
system to a previous version.

Regards,

Henk Plessius