+Notmuch supports running [[user defined hooks|manpages/notmuch-hooks-5]] before
+or after certain commands. Hooks can be arbitrary executable programs or
+scripts. For example, if you always run your mail delivery tool first and
+`notmuch new` after that, you can run the tool from Notmuch `pre-new` hook, and
+simply run `notmuch new` to do both. If you always do some tagging after
+indexing of new messages, you may want to set up a `post-new` or `post-insert`
+hook to do that automatically.
+
+## 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