diff --git a/hooks/backup/27-data_xmpp b/hooks/backup/27-data_xmpp
index 078184ed8..253aacdc2 100644
--- a/hooks/backup/27-data_xmpp
+++ b/hooks/backup/27-data_xmpp
@@ -9,5 +9,5 @@ source /usr/share/yunohost/helpers
 # Backup destination
 backup_dir="${1}/data/xmpp"
 
-ynh_backup /var/lib/metronome "${backup_dir}/var_lib_metronome" --not_mandatory
-ynh_backup /var/xmpp-upload/ "${backup_dir}/var_xmpp-upload" --not_mandatory
+[[ ! -d /var/lib/metronome ]] || ynh_backup /var/lib/metronome "${backup_dir}/var_lib_metronome" --not_mandatory
+[[ ! -d /var/xmpp-upload ]] || ynh_backup /var/xmpp-upload/ "${backup_dir}/var_xmpp-upload" --not_mandatory