add backup faq for flashback (#12312) (#12484)

* add backup faq for flashback * Update faq/backup-and-restore-faq.md Co-authored-by: xixirangrang <hfxsd@hotmail.com> * Update faq/backup-and-restore-faq.md --------- Co-authored-by: shichun-0415 <lishichun@pingcap.com> Co-authored-by: shichun-0415 <89768198+shichun-0415@users.noreply.github.com> Co-authored-by: xixirangrang <hfxsd@hotmail.com>
pingcap · Feb 14, 2023 · fe54b6a · fe54b6a
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diff --git a/faq/backup-and-restore-faq.md b/faq/backup-and-restore-faq.md
@@ -8,7 +8,9 @@ aliases: ['/tidb/v6.4/pitr-troubleshoot/','/tidb/v6.4/pitr-known-issues/']
 
 This document lists the frequently asked questions (FAQs) and the solutions of TiDB Backup & Restore (BR).
 
-## Performance issues of backup and restore
+## What should I do to quickly recover data after mistakenly deleting or updating data?
+
+TiDB v6.4.0 introduces the flashback feature. You can use this feature to quickly recover data within the GC time to a specified point in time. Therefore, if misoperations occur, you can use this feature to recover data. For details, see [Flashback Cluster](/sql-statements/sql-statement-flashback-to-timestamp.md) and [Flashback Database](/sql-statements/sql-statement-flashback-database.md).
 
 ## In TiDB v5.4.0 and later versions, when backup tasks are performed on the cluster under a heavy workload, why does the speed of backup tasks become slow?