What happens when file system is nearly full?

Nextcloud version (eg, 12.0.2): 16.0.5 snap
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04
Apache or nginx version (eg, Apache 2.4.25): From snap
PHP version (eg, 7.1): From snap

My Nextcloud data partition is nearly full. I’m currently not using user quotas.

  • Does Nextcloud gracefully handle a nearly full filesystem?
  • In particular does it purge older deleted files from the trash bin (if quotas are not enabled)?
  • Or do I need to enable quotas for this purging to take place?