Hi Bambang Wasminto,
Long-Term Retention (LTR) helps you keep backups for an extended period—up to 10 years—for safety, legal, or business reasons. It is built into Azure SQL, so you don’t need to use Azure Backup Vault separately. Azure automatically takes backups of your database, and LTR saves some of these backups for a longer time based on your chosen retention settings. You can decide how many weekly, monthly, and yearly backups to keep, such as 12 weeks, 12 months, or 10 years respectively. These backups are stored securely in Azure and do not affect your database performance. You can restore your database from these backups anytime you need. Even if you delete the database or server, the LTR backups remain safe. You can easily set up and manage LTR using the Azure Portal, PowerShell, or CLI.
Kindly refer to the document below:
https://learn.microsoft.com/en-us/azure/azure-sql/database/long-term-backup-retention-configure?view=azuresql-db&preserve-view=true&tabs=portal