No, that’s pretty straightforward.
Do a pg_dump
to backup your database, copy the /opt/indico/archive
folder and possibly your /opt/indico/etc/indico.conf
and /opt/indico/logs/
(if you want to keep that) as well.
Then on the new system you follow the installation guide but after creating the database you pg_restore
it and DO NOT run indico db prepare
(nor indico setup wizard
, unless you want to regenerate your indico.conf which is probably faster than copying it if you didn’t customize anything in there).