Changes to the LTR policy apply only to future backups. For example, if you modify the weekly backup retention (W), monthly backup retention (M), or yearly backup retention (Y), the new retention setting only applies to new backups. The retention of existing backups isn't modified. The LTR policy can be configured for each database in Azure SQL Database and Azure SQL Managed Instance. If you intend to delete old LTR backups before their retention period expires, you can [manually delete the backups](./long-term-backup-retention-configure.md#delete-ltr-backups).
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