[Unit]
Description=Dump of PostgreSQL Cluster %i
AssertPathExists=/etc/postgresql/%I/postgresql.conf
Wants=postgresql@%i.service
After=postgresql@%i.service
RequiresMountsFor=/var/backups/postgresql

[Service]
Type=oneshot
User=postgres
Environment="KEEP=3"
ExecStartPre=+/usr/bin/pg_backupcluster %i createdirectory
ExecStart=/usr/bin/pg_backupcluster %i dump
ExecStart=/usr/bin/pg_backupcluster %i expiredumps $KEEP