Update tidb-cloud/backup-and-restore.md

tidb-cloud/backup-and-restore.md

@@ -91,9 +91,9 @@ To configure the backup schedule, perform the following steps:
 
         > **Note**
         >
-        > - Auto-backups except the latest auto-backup will be deleted if the lifetime exceed the retention period. For the latest auto-backup, it will not be deleted until you delete it explicitly. This will prevent the cluster is deleted mistakenly and no data to restore.
-        > - After you delete a cluster, auto-backup which lifetime is not exceed the retention period will be retained in Recycle Bin. Auto-backups except the latest auto-backup will be deleted if the lifetime exceed the retention period. For the latest auto-backup, it will not be deleted until you delete it explicitly. This will prevent the cluster is deleted mistakenly and no data to restore.
-        > - After you delete a cluster, the existing manual backups will be retained until you manually delete them, or your account is closed.
+        > - All auto-backups, except the latest one, will be deleted if their lifetime exceeds the retention period. The latest auto-backup will not be deleted unless you delete it explicitly. This ensures that the cluster is not accidentally deleted without the ability to restore data.
+        > - After you delete a cluster, auto-backups with a lifetime within the retention period will be moved to the Recycle Bin. Auto-backups, except the latest one, will be deleted if their lifetime exceeds the retention period. The latest auto-backup will not be deleted unless you delete it explicitly. This prevents accidental cluster deletion with no data to restore.
+        > - After you delete a cluster, existing manual backups will be retained until manually deleted or your account is closed.
 
 ### Turn on dual region backup