Upgrade to 3.1 and next to 4.0.Two questions: security checks and disk space.

[alexandre suzuki <alex_o_suzuki@yahoo.com>]

I want to upgrade to the latest Sarge r7 and then
upgrade to Debian 4.0r2 and I am not sure about
two things:

1) I installed apt_0.5.28.6 and aptitude_0.2.15.9-2
  (from Sarge r7) and I don´t know if they do the
  security checks.Check Release.gpg and then the
  md5 automatically.I have the idea that only
  apt-0.6 and after do that automatically,I don´t
  have for example apt-key installed,and don´t
  have a trusted.gpg file in my /etc/apt/
  I have gpgv in /usr/local/bin which is on the
  bash binaries PATH,is that enough for apt to
  find it?
  
  
2)I only have available 700Mb in my hard drive 
  partition,so a global upgrade is not possible
  because I don´t have space for apt-get to download
  all upgradable packages first,and install
  them next,which is the method used by apt upgrades.
  APT gets rid probably of much of them after
  install but it´s not enough for me.So I´m
  planning to do so incrementally,upgrade a small
  group of packages after another group of packages.
  Is that the right method or is there a better
  one I don´t know about(I´m not planning to buy
  another hard disk).


                      Thanks.  



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