diff --git a/actionsmap/yunohost.yml b/actionsmap/yunohost.yml
index a3012d582..21bc23094 100644
--- a/actionsmap/yunohost.yml
+++ b/actionsmap/yunohost.yml
@@ -559,12 +559,8 @@ backup:
 
         ### backup_init()
         init:
-            action_help: Init Tahoe-LAFS configuration
-            # api: POST /backup/init
-            arguments:
-                --helper:
-                    help: Init as a helper node rather than a "helped" one
-                    action: store_true
+            action_help: Create an encrypted backup tarball
+            api: POST /backup
 
 
 #############################
@@ -1025,8 +1021,8 @@ tools:
                         pattern:
                             - '^.{3,}$'
                             - pattern_password
-                --dyndns:
-                    help: Subscribe domain to a DynDNS service
+                --ignore-dyndns:
+                    help: Do not subscribe domain to a DynDNS service
                     action: store_true
 
         ### tools_update()
diff --git a/backup.py b/backup.py
index 12b629d4e..e51e22885 100644
--- a/backup.py
+++ b/backup.py
@@ -26,27 +26,27 @@
 import os
 import sys
 import json
-import yaml
-import glob
+import time
 
 from moulinette.core import MoulinetteError
 
-def backup_init(helper=False):
+def backup():
     """
-    Init Tahoe-LAFS configuration
-
-    Keyword argument:
-        helper -- Init as a helper node rather than a "helped" one
+    Create an encrypted backup tarball
 
     """
-    tahoe_cfg_dir = '/usr/share/yunohost/yunohost-config/backup'
-    if helper:
-        configure_cmd = '/configure_tahoe.sh helper'
-    else:
-        configure_cmd = '/configure_tahoe.sh'
+    from yunohost.hook import hook_callback
 
-    os.system('tahoe create-client /home/yunohost.backup/tahoe')
-    os.system('/bin/bash %s%s' % (tahoe_cfg_dir, configure_cmd))
-    os.system('cp %s/tahoe.cfg /home/yunohost.backup/tahoe/' % tahoe_cfg_dir)
-    #os.system('update-rc.d tahoe-lafs defaults')
-    #os.system('service tahoe-lafs restart')
+    backup_dirname = int(time.time())
+    backup_dir = "/home/yunohost.backup/tmp/%s" % backup_dirname
+
+    # Create directory
+    try: os.listdir(backup_dir)
+    except OSError: os.makedirs(backup_dir)
+
+    # Run hook
+    hook_callback('backup', [backup_dir])
+
+    #TODO: Compress & encrypt
+
+    msignals.display(m18n.n('backup_completed'), 'success')
diff --git a/locales/en.json b/locales/en.json
index 65cf911fb..f615178fb 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -128,6 +128,8 @@
     "packages_upgrade_failed" : "Unable to upgrade all packages",
     "system_upgraded" : "System successfully upgraded",
 
+    "backup_complete" : "Backup complete",
+
     "field_invalid" : "Invalid field '{:s}'",
     "mail_domain_unknown" : "Unknown mail address domain '{:s}'",
     "mail_alias_remove_failed" : "Unable to remove mail alias '{:s}'",
diff --git a/locales/fr.json b/locales/fr.json
index 375ece04d..60880cb57 100644
--- a/locales/fr.json
+++ b/locales/fr.json
@@ -128,6 +128,8 @@
     "packages_upgrade_failed" : "Impossible de mettre à jour tous les paquets",
     "system_upgraded" : "Système mis à jour avec succès",
 
+    "backup_complete" : "Sauvegarde terminée",
+
     "field_invalid" : "Champ incorrect : {:s}",
     "mail_domain_unknown" : "Domaine '{:s}' de l'adresse mail inconnu",
     "mail_alias_remove_failed" : "Impossible de supprimer l'adresse mail supplémentaire '{:s}'",
diff --git a/tools.py b/tools.py
index b58cb5149..82d7325c8 100644
--- a/tools.py
+++ b/tools.py
@@ -207,7 +207,7 @@ def tools_maindomain(auth, old_domain=None, new_domain=None, dyndns=False):
     msignals.display(m18n.n('maindomain_changed'), 'success')
 
 
-def tools_postinstall(domain, password, dyndns=False):
+def tools_postinstall(domain, password, ignore_dyndns=False):
     """
     YunoHost post-install
 
@@ -230,7 +230,7 @@ def tools_postinstall(domain, password, dyndns=False):
     else:
         raise MoulinetteError(errno.EPERM, m18n.n('yunohost_already_installed'))
 
-    if len(domain.split('.')) >= 3:
+    if len(domain.split('.')) >= 3 and not ignore_dyndns:
         try:
             r = requests.get('http://dyndns.yunohost.org/domains')
         except ConnectionError:
@@ -310,9 +310,6 @@ def tools_postinstall(domain, password, dyndns=False):
     # Initialize YunoHost LDAP base
     tools_ldapinit(auth)
 
-    # Initialize backup system
-    backup_init()
-
     # New domain config
     tools_maindomain(auth, old_domain='yunohost.org', new_domain=domain, dyndns=dyndns)