diff --git a/management/backup.py b/management/backup.py
index 93136bf5..8de37ba5 100755
--- a/management/backup.py
+++ b/management/backup.py
@@ -473,6 +473,8 @@ def backup_set_custom(env, target, target_user, target_pass, min_age):
 	config["target_pass"] = target_pass
 	config["min_age_in_days"] = min_age
 
+	write_backup_config(env, config)
+    
 	# Validate.
 	try:
 		if config["target"] not in ("off", "local"):
@@ -482,8 +484,6 @@ def backup_set_custom(env, target, target_user, target_pass, min_age):
 	except ValueError as e:
 		return str(e)
 
-	write_backup_config(env, config)
-
 	return "OK"
 
 def get_backup_config(env, for_save=False, for_ui=False):