Create and set ownership to backup directory

debian/postgres-backup.dirs

@@ -0,0 +1 @@
+/var/backups/database/postgresql

debian/postgres-backup.postinst

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+mkdir -p /var/backups/database/postgresql
+chown -R postgres:postgres /var/backups/database/postgresql

debian/rules

@@ -20,6 +20,5 @@ override_dh_auto_install:
 	chmod +x debian/postgres-backup/usr/share/postgres-backup/pg_backup.sh
 
 	install -D -m 644 debian/postgres-backup.timer debian/postgres-backup/lib/systemd/system/postgres-backup.timer
-	install -d -o postgres -g postgres debian/postgres-backup/var/backups/database/postgresql
 
 	install -d debian/postgres-backup