diff --git a/roles/ynh_backup/README-FR.md b/roles/ynh_backup/README-FR.md
index 3a383e8cfae39fb28641f5be5f1386a9d1f6be86..e36ffae1bb77dc8653fcb75e544571bb4cce11b2 100644
--- a/roles/ynh_backup/README-FR.md
+++ b/roles/ynh_backup/README-FR.md
@@ -32,6 +32,8 @@ ynh_backup:
   apps: True
   src_script: "templates/ynh_backup.sh.j2"
   dest_script: "/usr/bin"
+
+number_days_to_keep: "2"
 ```
 
 - `ynh_backup.scheduled` : active la fonctionnalité de sauvegarde des applications YunoHost, mettez la valeur à `True`.
@@ -39,6 +41,7 @@ ynh_backup:
 - `ynh_backup.scheduled_[hour|minute|weekday|month]`: modifie la planification de la tâche cron. Par défaut, elle se déclenchera tous les jours de l'année à 1 heure du matin. Pour plus d'informations concernant les réglages horaires cron, cet outil peut être utile : <https://crontab.guru/>.
 - `ynh_backup.system` : **obligatoire**. Activez la sauvegarde du système YunoHost en mettant la valeur à `True`.
 - `ynh_backup.apps` : **obligatoire**. Activez la sauvegarde des applications YunoHost en mettant la valeur à `True`.
+- `number_days_to_keep` : **obligatoire**. Détermine le nombre de jours à garder pour le système de purge.
 
 ### Sauvegardes distantes avec BorgBackup
 
diff --git a/roles/ynh_backup/README.md b/roles/ynh_backup/README.md
index 2c332bd2816600b3c2757eadafed3d5917548588..5ce82387f84c5991ab79c115da8693d2038768f7 100644
--- a/roles/ynh_backup/README.md
+++ b/roles/ynh_backup/README.md
@@ -39,6 +39,7 @@ ynh_backup:
 - `ynh_backup.scheduled_[hour|minute|weekday|month]`: modifies the scheduling of the cron task. By default, it will run every day of the year at 1am. For more information about cron time settings, this tool can be useful: <https://crontab.guru/>.
 - `ynh_backup.system`: **mandatory**. Enables automatic backup of the YunoHost system by setting the value to `True`.
 - `ynh_backup.apps`: **mandatory**. Enables automatic backup of YunoHost applications by setting the value to `True`.
+- `number_days_to_keep` : **mandatory**. Determines the number of days to keep for the purging system.
 
 ### remote backups with YunoHost BorgBackup
 
diff --git a/roles/ynh_backup/defaults/main.yml b/roles/ynh_backup/defaults/main.yml
index 99c2dc45cb78c7f4aaf1a3794863b18345d439ea..fa8dd2f7c6ec614a828944a76fa00a82b7a7503b 100644
--- a/roles/ynh_backup/defaults/main.yml
+++ b/roles/ynh_backup/defaults/main.yml
@@ -29,6 +29,8 @@ ynh_backup:
   # system: True
   # apps: True
 
+number_days_to_keep: "2"
+
 # Variables for YunoHost BorgBackup
 ynh_borg_backup_scheduled: False
 borg_source_directories:
diff --git a/roles/ynh_backup/templates/ynh_backup.sh.j2 b/roles/ynh_backup/templates/ynh_backup.sh.j2
index 8dff693b5ad33ffd96b94dd866862d3a31c1b0ff..8021f9c461b85290d643e0f40781fab5ac081fc9 100644
--- a/roles/ynh_backup/templates/ynh_backup.sh.j2
+++ b/roles/ynh_backup/templates/ynh_backup.sh.j2
@@ -1,25 +1,33 @@
-#!/bin/sh
+#!/bin/bash
+today="$(date +%Y%m%d)"
+number_to_keep="{{ number_days_to_keep }}"
+old_backup_list="$(yunohost backup list --output-as plain | head -n -"$number_to_keep")" # Afficher toutes les lignes de sauvegardes à part les deux dernières.
 
-today=$(date +%Y%m%d_%H%M)
-old_backup=$(yunohost backup list --output-as plain | grep "$(date --date="2 days ago" +"%Y%m%d")")
+_good() {
+    echo "SUCCESS: ${1}" && exit 0
+}
 
-_check_old_backup() {
-  if [ -n "$old_backup" ]; then
-    for i in $old_backup; do
-      echo "Backup $i is 2 days old or more. Purging it now."
-      yunohost backup delete "$i"
-      echo "Purging of old backup is now complete."
-    done
-  else
-    echo "There is no old backup to be purged."
-  fi
+_fail() {
+    echo "ERROR: ${1}" && exit 1
 }
 
 _create_ynh_backup() {
   echo "Backing up $today YunoHost data now."
-  yunohost backup create {% if ynh_backup.system %}--system{% endif %}{% if ynh_backup.apps %} --apps{% endif %}{% if ynh_backup.directory %} --output-directory {{ ynh_backup.directory }}/backup_"$today" {% endif %}
+  yunohost backup create {% if ynh_backup.system %}--system{% endif %}{% if ynh_backup.apps %} --apps{% endif %}{% if ynh_backup.directory %} --output-directory {{ ynh_backup.directory }}/backup_"$today" {% endif %} || _fail "can't create a backup"
 
 }
 
-_check_old_backup
+_prune_old_backup() {
+  if [ -n "$old_backup_list" ]; then
+    for backup in $old_backup_list; do
+      echo "Backup $backup is 2 days old or more. Purging it now."
+      yunohost backup delete "$backup"
+    done
+    _good "Purging of old backups completed."
+  else
+    _good "There is no old backup to be purged."
+  fi
+}
+
 _create_ynh_backup
+_prune_old_backup