diff --git a/plinth/modules/backups/forms.py b/plinth/modules/backups/forms.py
index 5b0d9c07f..30c5471b4 100644
--- a/plinth/modules/backups/forms.py
+++ b/plinth/modules/backups/forms.py
@@ -15,6 +15,7 @@ from django.core.validators import (FileExtensionValidator,
 from django.utils.translation import gettext
 from django.utils.translation import gettext_lazy as _
 
+from plinth import cfg
 from plinth.modules.storage import get_mounts
 from plinth.utils import format_lazy
 
@@ -138,7 +139,11 @@ class UploadForm(forms.Form):
         label=_('Upload File'), required=True, validators=[
             FileExtensionValidator(
                 ['gz'], _('Backup files have to be in .tar.gz format'))
-        ], help_text=_('Select the backup file you want to upload'))
+        ], help_text=format_lazy(
+            _('Select the backup file to upload from the local computer. This '
+              'must be a file previously downloaded from the result of a '
+              'successful backup on a {box_name}. It must have a .tar.gz '
+              'extension.'), box_name=_(cfg.box_name)))
 
 
 def repository_validator(path):