we did the upgrade on the server, no need to keep a todo here

howto/backup.md

@@ -1157,8 +1157,6 @@ the new one, and backups should resume. The old server can now be
 [decommissioned](howto/retire-a-host), if it's still around, when you feel
 comfortable the new setup is working.
 
-TODO: `15:19:55 <weasel> and once that's up and running, it'd probably be smart to upgrade it to 11.  pg_upgradecluster -m upgrade --link`
-
 TODO: some psql users still refer to host-specific usernames like
 `bacula-dictyotum-reader`, maybe they should refer to role-specific
 names instead?