This was done by taking the gitlab redirections and turning it into a
sed script, mostly by hand.

service/lists.md

@@ -445,7 +445,7 @@ above formula as a simple "noop" Fabric task.
 ### Data loss
 
 If a server is destroyed or its data partly destroyed, it should be
-able to recover on-disk files through the normal [backup](howto/backup) system,
+able to recover on-disk files through the normal [backup](service/backup) system,
 with a RTO of about 24h.
 
 Puppet should be able to rebuild a mostly functional Mailman 3 base