Update Upgrading.md

docs/en/Upgrading.md

@@ -18,6 +18,8 @@ Run this command in the terminal while you are in the root folder of your soluti
 
 ### Database Migrations
 
+> Warning: Be careful if you are migrating your database since you may have data loss in some cases. Carefully check the generated migration code before executing it. It is suggested to take a backup of your current database.
+
 When you upgrade to a new version, it is good to check if there is a database schema change and upgrade your database schema if your database provider is **Entity Framework Core**;
 
 * Use `Add-Migration "Upgraded_To_Abp_4_1"` or a similar command in the Package Manager Console (PMC) to create a new migration (Set the `EntityFrameworkCore.DbMigrations` as the Default project in the PMC and `.DbMigrator` as the Startup Project in the Solution Explorer, in the Visual Studio).