Update backups.md

Author: Musealali

umbraco-cloud/databases/backups.md

@@ -10,6 +10,13 @@ description: >-
 Read more about Umbraco Cloud's Backup and data retention policy in the FAQ.
 {% endhint %}
 
+## Limitations
+
+When restoring a database backup on Umbraco Cloud, certain elements could cause issues:
+
+- **SQL Server logins** - Those could be stored at the server level (in the master database) rather than within the user database itself.
+- **Complex Database Objects** - A complex database object in SQL is an element with external dependencies, special server configurations.
+
 ## Backup on Umbraco Cloud
 
 On Umbraco Cloud, you can utilize our 35-day point-in-time recovery to create and download a `bacpac` file from your project.