I choose to backup all tables. In the admin panel section of the dashboard, Snapshot shows (see screenshot):
Tables: (all), 17 core, 46 non-core
If I open the site's database with phpadmin, I see much more tables. Anyhow, I am not an expert and may confuse something here... Just want to make sure that the backup is really complete.
Thanks for confirming that the numbers are right, or for advise how to include ALL tables.