diff --git a/tools/backups/backup_rotation.sh b/tools/backups/backup_rotation.sh
index cfab628d..a4b4a826 100755
--- a/tools/backups/backup_rotation.sh
+++ b/tools/backups/backup_rotation.sh
@@ -11,10 +11,10 @@
 # Must contain backup.monthly backup.weekly backup.daily backup.hourly folders
 storage="$1"
 
-NB_HOURLY=48   # nb de sauvegardes horaires a conserver (1 par heure)
-NB_DAILY=40    # nb de sauvegardes quotidiennes a conserver
-NB_WEEKLY=30   # nombre de sauvegardes hebdomadaires a conserver
-NB_MONTHLY=200 # nombre de sauvegardes mensuelles a conserver
+NB_HOURLY=24   # nb de sauvegardes horaires a conserver (1 par heure)
+NB_DAILY=7    # nb de sauvegardes quotidiennes a conserver
+NB_WEEKLY=4   # nombre de sauvegardes hebdomadaires a conserver
+NB_MONTHLY=12 # nombre de sauvegardes mensuelles a conserver
 
 # Work in backup directory:
 cd $storage
diff --git a/tools/etc/scodoc-backup-db.service b/tools/etc/scodoc-backup-db.service
new file mode 100644
index 00000000..d17e7a1a
--- /dev/null
+++ b/tools/etc/scodoc-backup-db.service
@@ -0,0 +1,18 @@
+#
+# Systemd service to backup ScoDoc postgresql database
+#
+# Put this file in /etc/systemd/system, along with scodoc-updater.timer
+# and then run
+#    systemctl enable scodoc-updater.timer
+#    systemctl start scodoc-updater.timer
+# 
+# E. Viennet jun 2019
+#
+
+[Unit]
+Description=Update ScoDoc Software
+
+[Service]
+Type=oneshot
+ExecStart=/opt/scodoc/tools/backup_db9 SCODOC
+
diff --git a/tools/etc/scodoc-backup-db.timer b/tools/etc/scodoc-backup-db.timer
new file mode 100644
index 00000000..68a22c38
--- /dev/null
+++ b/tools/etc/scodoc-backup-db.timer
@@ -0,0 +1,16 @@
+#
+# Systemd service to upgrade ScoDoc
+#
+# Put this file in /etc/systemd/system, along with scodoc-updater.service
+#
+# E. Viennet oct 2023
+#
+
+[Unit]
+Description=Dump ScoDoc database each hour (*:07)
+
+[Timer]
+OnCalendar=*-*-* *:07:00
+
+[Install]
+WantedBy=timers.target