+## Backing Up and Restoring the Database
+
+The Notmuch database contains a search index of your messages, along with all
+the tags you've added to your messages. The search index can be regenerated by
+indexing the messages again, but the tags will be lost if the database is
+lost. (If you have `maildir.synchronize_flags` configuration option enabled,
+also some of the tags can be regenerated from maildir flags.)
+
+To create a plain-text dump of the tags, run
+
+ notmuch dump --output=dump.txt
+
+To restore the tags from the dump, run
+
+ notmuch restore --input=dump.txt