Comment by shasts

Current work machine. Running fine for 4.5 years.

  $ stat / | grep "Birth" | sed 's/Birth: //g' | cut -b 2-11
  2020-06-20



  $ cat /etc/apt/sources.list.d/debian.sources
  # Modernized from /etc/apt/sources.list
  Types: deb deb-src
  URIs: http://deb.debian.org/debian/
  Suites: unstable
  Components: main non-free contrib
  Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg

  # Modernized from /etc/apt/sources.list
  Types: deb
  URIs: http://deb.debian.org/debian/
  Suites: testing
  Components: main non-free non-free-firmware contrib
  Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg

You may also want `apt-listbugs` package to see the serious bugs before running upgrade.