for maintaining git-only backups.
For v2 inboxes, it will maintain C<$INBOX_DIR/manifest.js.gz>
-file to speed up future invocations.
+file to speed up future invocations. It always safe to remove
+manifest.js.gz, it is merely an optimization and will be
+restored on the next invocation.
+
+To prevent fetches on any v2 epoch, use L<chmod(1)> to remove
+write permissions to the top-level of the epoch. For example,
+to disable fetches on epoch 4:
+
+ chmod a-w $INBOX_DIR/git/4.git
+
+If you wish to re-enable fetches to the epoch:
+
+ chmod u+w $INBOX_DIR/git/4.git
=head1 OPTIONS
Quiets down progress messages, also passed to L<git-fetch(1)>.
+=item -T REMOTE
+
+=item --try-remote REMOTE
+
+Try a given remote name instead of C<origin> or C<_grokmirror>.
+May be specified more than once.
+
+Default: C<origin>, C<_grokmirror>
+
=item --exit-code
Exit with C<127> if no updates are done. This can be used in