Safe to delete postgres_data_old?

Supporto Installazione
1

Running low on disk space, discovered 5.5Gb postgres_data_old in /var/discourse/shared/standalone. File dates at least a few weeks old.

See it referenced in a few places here, guessing it’s part of a backup that’s no longer needed. Is it safe to delete?

2

Sure, its fine, if the upgrade from pg 9.3 to 9.5 all went well you can delete that folder.