E: Release file for http://archive.debian.org/debian/dists/jessie-backports/InRelease is expired (invalid since 715d 18h 14min 9s). Updates for this repository will not be applied Update Wheezy or Jessie Repo

Wheezy and jessie both has gone EOL and repos too. archive repo doesn’t seem to usually work either. So here’s a little trick that worked for me. Below is my repo.list file-

deb http://archive.debian.org/debian jessie main
deb http://archive.debian.org/debian-archive/debian-security/ jessie updates/ma$
#deb http://security.debian.org/ jessie/updates non-free contrib main
#deb http://mirrors.ocf.berkeley.edu/debian/ jessie-updates main contrib non-fr$
deb http://security.debian.org/ jessie/updates main
deb http://ftp.fr.debian.org/debian jessie-updates main

Nowupdate apt as below-

apt-get update -o Acquire::Check-Valid-Until=false;

Install stuff.

apt-get install nano inotify-tools msmtp -o Acquire::Check-Valid-Until=false;

No guarantee how long this will work for, but it worked for me in Feb 2021. Use at your own risk.

Src:

https://serverfault.com/questions/960970/wheezy-updates-on-archive-debian-org-returns-404-not-found