Problem (1)

Expiration is too short:

At nyftp (daily master site), 
ftp://nyftp.netbsd.org/pub/NetBSD-daily/

This keeps daily snapshot 
 (for HEAD, netbsd-5 netbsd-5-0) etc
Usually a few days
simple rule 
ignoring arch by arch situation.

  It results some architecture(s) do not have release(8) at all.