br: update adaptive GC description (#4262)

* br: update adaptive GC description * Update br/backup-and-restore-use-cases.md Co-authored-by: Ran <[email protected]> Co-authored-by: Ran <[email protected]>
pingcap · Nov 20, 2020 · ecd7075 · ecd7075
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diff --git a/br/backup-and-restore-use-cases.md b/br/backup-and-restore-use-cases.md
@@ -91,6 +91,10 @@ For the detailed usage of the `br backup` command, refer to [BR command-line des
     UPDATE mysql.tidb SET VARIABLE_VALUE = '10m' WHERE VARIABLE_NAME = 'tikv_gc_life_time';
     ```
 
+> **Note:**
+>
+> Since v4.0.8, BR supports the self-adaptive GC. To avoid manually adjusting GC, register `backupTS` in `safePoint` in PD and make sure that `safePoint` does not move forward during the backup process.
+
 ### Preparation for restoration
 
 For the detailed usage of the `br restore` command, refer to [BR command-line description](/br/backup-and-restore-tool.md#command-line-description).