Would you please consider updating phpbb3. The current version was released May 2021. Some worthwhile changes described here: https://wiki.phpbb.com/Release_Highlights/3.3.4 Notably postgresql backup error was addressed in 3.3.2 https://tracker.phpbb.com/browse/PHPBB3-16525 And security improvement in 3.3.3
^Triage: MFH: 2020Q3 (Bugfix and security release(s))
phpbb 3.3.5 is currently in the ports