diff --git a/docs/configuring-playbook-own-webserver.md b/docs/configuring-playbook-own-webserver.md
index 4f0d35910..ee4402b34 100644
--- a/docs/configuring-playbook-own-webserver.md
+++ b/docs/configuring-playbook-own-webserver.md
@@ -220,7 +220,7 @@ services:
       - "--certificatesresolvers.default.acme.storage=/letsencrypt/acme.json"
     ports:
       - "443:443"
-      - "8080:8080"
+      - "8448:8448"
     volumes:
       - "./letsencrypt:/letsencrypt"
       - "/var/run/docker.sock:/var/run/docker.sock:ro"
diff --git a/docs/maintenance-postgres.md b/docs/maintenance-postgres.md
index 14d5cdb90..93d0d0bf0 100644
--- a/docs/maintenance-postgres.md
+++ b/docs/maintenance-postgres.md
@@ -69,7 +69,7 @@ This playbook can upgrade your existing Postgres setup with the following comman
 
 	ansible-playbook -i inventory/hosts setup.yml --tags=upgrade-postgres
 
-**The old Postgres data directory is backed up** automatically, by renaming it to `/matrix/postgres-auto-upgrade-backup`.
+**The old Postgres data directory is backed up** automatically, by renaming it to `/matrix/postgres/data-auto-upgrade-backup`.
 To rename to a different path, pass some extra flags to the command above, like this: `--extra-vars="postgres_auto_upgrade_backup_data_path=/another/disk/matrix-postgres-before-upgrade"`
 
 The auto-upgrade-backup directory stays around forever, until you **manually decide to delete it**.
diff --git a/group_vars/matrix_servers b/group_vars/matrix_servers
index dabe0d756..6111600e5 100755
--- a/group_vars/matrix_servers
+++ b/group_vars/matrix_servers
@@ -129,7 +129,7 @@ matrix_appservice_slack_systemd_required_services_list: |
   }}
 
 # Postgres is the default, except if not using `matrix_postgres` (internal postgres)
-matrix_appservice_slack_database_engine: "{{ 'postgres' if matrix_postgres_enabled else 'sqlite' }}"
+matrix_appservice_slack_database_engine: "{{ 'postgres' if matrix_postgres_enabled else 'nedb' }}"
 matrix_appservice_slack_database_password: "{{ matrix_synapse_macaroon_secret_key | password_hash('sha512', 'as.slack.db') | to_uuid }}"
 
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