diff --git a/chrono/agendas/models.py b/chrono/agendas/models.py
index 71b1bcdc..3c81830c 100644
--- a/chrono/agendas/models.py
+++ b/chrono/agendas/models.py
@@ -1146,6 +1146,7 @@ class Desk(models.Model):
     def import_json(cls, data):
         timeperiods = data.pop('timeperiods', [])
         exceptions = data.pop('exceptions', [])
+        sources = data.pop('exception_sources', [])
         data = clean_import_data(cls, data)
         desk, created = cls.objects.update_or_create(slug=data['slug'], agenda=data['agenda'], defaults=data)
         for timeperiod in timeperiods:
@@ -1154,14 +1155,20 @@ class Desk(models.Model):
         for exception in exceptions:
             exception['desk'] = desk
             TimePeriodException.import_json(exception)
+        for source in sources:
+            source['desk'] = desk
+            TimePeriodExceptionSource.import_json(source)
         return desk
 
     def export_json(self):
+        time_period_exceptions = self.timeperiodexception_set.filter(source__settings_slug__isnull=True)
+        time_period_exception_sources = self.timeperiodexceptionsource_set.filter(settings_slug__isnull=False)
         return {
             'label': self.label,
             'slug': self.slug,
-            'timeperiods': [time_period.export_json() for time_period in self.timeperiod_set.all()],
-            'exceptions': [exception.export_json() for exception in self.timeperiodexception_set.all()],
+            'timeperiods': [time_period.export_json() for time_period in self.timeperiod_set.filter()],
+            'exceptions': [exception.export_json() for exception in time_period_exceptions],
+            'exception_sources': [source.export_json() for source in time_period_exception_sources],
         }
 
     def duplicate(self, label=None, agenda_target=None):
@@ -1485,6 +1492,22 @@ class TimePeriodExceptionSource(models.Model):
         self.enabled = False
         self.save()
 
+    @classmethod
+    def import_json(cls, data):
+        data = clean_import_data(cls, data)
+        source, _ = cls.objects.update_or_create(**data)
+        if source.enabled:
+            source.enable()
+        return source
+
+    def export_json(self):
+        '''Export only sources from settings.'''
+        return {
+            'settings_slug': self.settings_slug,
+            'settings_label': self.settings_label,
+            'enabled': self.enabled,
+        }
+
 
 class UnavailabilityCalendar(models.Model):
     label = models.CharField(_('Label'), max_length=150)
diff --git a/tests/test_import_export.py b/tests/test_import_export.py
index acb536ff..643753c1 100644
--- a/tests/test_import_export.py
+++ b/tests/test_import_export.py
@@ -14,6 +14,7 @@ import tempfile
 import pytest
 from django.contrib.auth.models import Group
 from django.core.management import call_command, CommandError
+from django.test import override_settings
 from django.utils.encoding import force_bytes
 from django.utils.timezone import make_aware, now
 
@@ -25,6 +26,7 @@ from chrono.agendas.models import (
     Resource,
     TimePeriod,
     TimePeriodException,
+    TimePeriodExceptionSource,
     AgendaImportError,
     MeetingType,
     VirtualMember,
@@ -531,3 +533,35 @@ def test_import_export_reminder_settings():
 
     # again - check OneToOneField
     import_site(payload)
+
+
+@override_settings(
+    EXCEPTIONS_SOURCES={'holidays': {'class': 'workalendar.europe.France', 'label': 'Holidays'},}
+)
+def test_import_export_time_period_exception_source():
+    agenda = Agenda.objects.create(label='Foo bar', kind='meetings')
+    desk = Desk.objects.create(slug='test', agenda=agenda)
+    desk.import_timeperiod_exceptions_from_settings(enable=True)
+
+    output = get_output_of_command('export_site')
+    payload = json.loads(output)
+
+    agenda.delete()
+    assert not TimePeriodExceptionSource.objects.exists()
+
+    import_site(payload)
+    desk = Desk.objects.get(slug='test')
+    source = desk.timeperiodexceptionsource_set.first()
+    assert source.enabled
+    assert desk.timeperiodexception_set.exists()
+
+    source.disable()
+    output = get_output_of_command('export_site')
+    payload = json.loads(output)
+    Agenda.objects.all().delete()
+
+    import_site(payload)
+    desk = Desk.objects.get(slug='test')
+    source = desk.timeperiodexceptionsource_set.first()
+    assert not source.enabled
+    assert not desk.timeperiodexception_set.exists()