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+============
+notmuch-dump
+============
+
+SYNOPSIS
+========
+
+**notmuch** **dump** [--format=(batch-tag|sup)] [--] [--output=<*file*>] [--] [<*search-term*> ...]
+
+DESCRIPTION
+===========
+
+Dump tags for messages matching the given search terms.
+
+Output is to the given filename, if any, or to stdout.
+
+These tags are the only data in the notmuch database that can't be
+recreated from the messages themselves. The output of notmuch dump is
+therefore the only critical thing to backup (and much more friendly to
+incremental backup than the native database files.)
+
+``--format=(sup|batch-tag)``
+    Notmuch restore supports two plain text dump formats, both with one
+    message-id per line, followed by a list of tags.
+
+    **batch-tag**
+        The default **batch-tag** dump format is intended to more robust
+        against malformed message-ids and tags containing whitespace or
+        non-\ **ascii(7)** characters. Each line has the form
+
+            +<*encoded-tag*\ > +<*encoded-tag*\ > ... --
+            id:<*quoted-message-id*\ >
+
+        Tags are hex-encoded by replacing every byte not matching the
+        regex **[A-Za-z0-9@=.,\_+-]** with **%nn** where nn is the two
+        digit hex encoding. The message ID is a valid Xapian query,
+        quoted using Xapian boolean term quoting rules: if the ID
+        contains whitespace or a close paren or starts with a double
+        quote, it must be enclosed in double quotes and double quotes
+        inside the ID must be doubled. The astute reader will notice
+        this is a special case of the batch input format for
+        **notmuch-tag(1)**; note that the single message-id query is
+        mandatory for **notmuch-restore(1)**.
+
+    **sup**
+        The **sup** dump file format is specifically chosen to be
+        compatible with the format of files produced by sup-dump. So if
+        you've previously been using sup for mail, then the **notmuch
+        restore** command provides you a way to import all of your tags
+        (or labels as sup calls them). Each line has the following form
+
+            <*message-id*\ > **(** <*tag*\ > ... **)**
+
+        with zero or more tags are separated by spaces. Note that
+        (malformed) message-ids may contain arbitrary non-null
+        characters. Note also that tags with spaces will not be
+        correctly restored with this format.
+
+    With no search terms, a dump of all messages in the database will be
+    generated. A "--" argument instructs notmuch that the remaining
+    arguments are search terms.
+
+    See **notmuch-search-terms(7)** for details of the supported syntax
+    for <search-terms>.
+
+SEE ALSO
+========
+
+**notmuch(1)**, **notmuch-config(1)**, **notmuch-count(1)**,
+**notmuch-hooks(5)**, **notmuch-insert(1)**, **notmuch-new(1)**,
+**notmuch-reply(1)**, **notmuch-restore(1)**, **notmuch-search(1)**,
+**notmuch-search-terms(7)**, **notmuch-show(1)**, **notmuch-tag(1)**