Update backup app to use the App model from the app registry models

apps/backups/forms.py

@@ -2,12 +2,21 @@ from __future__ import absolute_import
 
 from django import forms
 
+from app_registry.models import App
+
 from .models import BackupJob
+from .api import AppBackup
+
+
+def valid_app_choices():
+    return App.live.filter(name__in=[appbackup.name for appbackup in AppBackup.get_all()])
 
 
 class BackupJobForm(forms.ModelForm):
     #expiration_datetime = SplitTimeDeltaField()
 
+    apps = forms.ModelChoiceField(queryset=valid_app_choices())
+
     class Meta:
         model = BackupJob
         #exclude = ('checkout_datetime', 'user_content_type', 'user_object_id')