diff --git a/plinth/modules/backups/templates/backups_delete.html b/plinth/modules/backups/templates/backups_delete.html
index 9f16ec78d..93626fbe6 100644
--- a/plinth/modules/backups/templates/backups_delete.html
+++ b/plinth/modules/backups/templates/backups_delete.html
@@ -27,7 +27,7 @@
   </div>
 
   <p>
-    <form class="form" method="post">
+    <form class="form form-delete" method="post">
       {% csrf_token %}
 
       <input type="submit" class="btn btn-danger"
diff --git a/plinth/modules/backups/templates/backups_restore.html b/plinth/modules/backups/templates/backups_restore.html
index ac80828ae..eb370842d 100644
--- a/plinth/modules/backups/templates/backups_restore.html
+++ b/plinth/modules/backups/templates/backups_restore.html
@@ -17,7 +17,7 @@
   {% endif %}
 
   <p>
-    <form class="form" method="post">
+    <form class="form form-restore" method="post">
       {% csrf_token %}
 
       {{ form|bootstrap }}
diff --git a/plinth/modules/backups/templates/backups_upload.html b/plinth/modules/backups/templates/backups_upload.html
index 665bcba54..d63fa499a 100644
--- a/plinth/modules/backups/templates/backups_upload.html
+++ b/plinth/modules/backups/templates/backups_upload.html
@@ -32,7 +32,7 @@
     </div>
   {% endif %}
 
-  <form class="form" enctype="multipart/form-data" method="post">
+  <form class="form form-upload" enctype="multipart/form-data" method="post">
     {% csrf_token %}
 
     {{ form|bootstrap }}
diff --git a/plinth/modules/backups/tests/test_functional.py b/plinth/modules/backups/tests/test_functional.py
index fe068ded1..05b1525e0 100644
--- a/plinth/modules/backups/tests/test_functional.py
+++ b/plinth/modules/backups/tests/test_functional.py
@@ -150,7 +150,7 @@ def _backup_schedule_set(browser, enable, daily, weekly, monthly, run_at,
     functional.eventually(browser.find_by_css, args=['.select-all'])
     browser.find_by_css('.select-all').first.check()
     browser.find_by_css(f'input[value="{without_app}"]').first.uncheck()
-    functional.submit(browser)
+    functional.submit(browser, form_class='form-backups_schedule')
 
 
 def _download_file_logged_in(browser, url, suffix=''):
@@ -186,8 +186,8 @@ def _upload_and_restore(browser, app_name, downloaded_file_path):
     fileinput = browser.driver.find_element_by_id('id_backups-file')
     fileinput.send_keys(downloaded_file_path)
     # submit upload form
-    functional.submit(browser)
+    functional.submit(browser, form_class='form-upload')
     # submit restore form
     with functional.wait_for_page_update(browser,
                                          expected_url='/plinth/sys/backups/'):
-        functional.submit(browser)
+        functional.submit(browser, form_class='form-restore')
diff --git a/plinth/tests/functional/__init__.py b/plinth/tests/functional/__init__.py
index db024270b..4f79738ad 100644
--- a/plinth/tests/functional/__init__.py
+++ b/plinth/tests/functional/__init__.py
@@ -506,26 +506,28 @@ def set_advanced_mode(browser, mode):
 ####################
 # Backup utilities #
 ####################
-def _click_button_and_confirm(browser, href):
+def _click_button_and_confirm(browser, href, form_class):
     buttons = browser.links.find_by_href(href)
     if buttons:
-        submit(browser, buttons.first)
-        submit(browser, expected_url='/plinth/sys/backups/')
+        submit(browser, element=buttons.first)
+        submit(browser, form_class=form_class,
+               expected_url='/plinth/sys/backups/')
 
 
 def _backup_delete_archive_by_name(browser, archive_name):
     nav_to_module(browser, 'backups')
     href = f'/plinth/sys/backups/root/delete/{archive_name}/'
-    _click_button_and_confirm(browser, href)
+    _click_button_and_confirm(browser, href, 'form-delete')
 
 
 def backup_create(browser, app_name, archive_name=None):
+    """Create a new backup for a given app."""
     install(browser, 'backups')
     if archive_name:
         _backup_delete_archive_by_name(browser, archive_name)
 
     buttons = browser.links.find_by_href('/plinth/sys/backups/create/')
-    submit(browser, buttons.first)
+    submit(browser, element=buttons.first)
     eventually(browser.find_by_css, args=['.select-all'])
     browser.find_by_css('.select-all').first.uncheck()
     if archive_name:
@@ -534,13 +536,14 @@ def backup_create(browser, app_name, archive_name=None):
     # ensure the checkbox is scrolled into view
     browser.execute_script('window.scrollTo(0, 0)')
     browser.find_by_value(app_name).first.check()
-    submit(browser)
+    submit(browser, form_class='form-backups')
 
 
 def backup_restore(browser, app_name, archive_name=None):
+    """Restore a given app from a backup archive."""
     nav_to_module(browser, 'backups')
     href = f'/plinth/sys/backups/root/restore-archive/{archive_name}/'
-    _click_button_and_confirm(browser, href)
+    _click_button_and_confirm(browser, href, 'form-restore')
 
 
 ######################