Factory Reset and some questions

so I had exactly the same URL's in /etc/apt/sources.list, but I needed to update the apt.conf according to that past from Sandshark.  Which I did..I still get some errors ....but after that now I am able to run the nzbget-run installer without error....so something must have been corrected with apt that way.

I do see the following errors or warnings when I run `apt update`, not sure what to make of it, something about key expired?:

root@webman:/etc/apt# apt update                                                                                                 
Get:1 http://archive.debian.org/debian-security jessie/updates InRelease [44.9 kB]
Ign:2 http://archive.kernel.org/debian-archive/debian jessie InRelease
Ign:3 https://apt.readynas.com/packages/readynasos 6.10.9 InRelease
Get:4 http://archive.kernel.org/debian-archive/debian jessie-backports InRelease [166 kB]
Ign:1 http://archive.debian.org/debian-security jessie/updates InRelease
Err:5 https://apt.readynas.com/packages/readynasos 6.10.9 Release
  403  Forbidden                                                                                                                 
Get:6 http://archive.kernel.org/debian-archive/debian jessie Release [148 kB]
Ign:4 http://archive.kernel.org/debian-archive/debian jessie-backports InRelease
Get:7 http://archive.kernel.org/debian-archive/debian jessie Release.gpg [2,420 B]
Ign:7 http://archive.kernel.org/debian-archive/debian jessie Release.gpg
Hit:8 http://archive.kernel.org/debian-archive/debian jessie/main amd64 Packages
Ign:8 http://archive.kernel.org/debian-archive/debian jessie/main amd64 Packages
Hit:9 http://archive.kernel.org/debian-archive/debian jessie/contrib amd64 Packages
Hit:10 http://archive.kernel.org/debian-archive/debian jessie/non-free amd64 Packages
Ign:9 http://archive.kernel.org/debian-archive/debian jessie/contrib amd64 Packages
Ign:10 http://archive.kernel.org/debian-archive/debian jessie/non-free amd64 Packages
Get:8 http://archive.kernel.org/debian-archive/debian jessie/main amd64 Packages [9,098 kB]
Get:9 http://archive.kernel.org/debian-archive/debian jessie/contrib amd64 Packages [59.2 kB]
Get:10 http://archive.kernel.org/debian-archive/debian jessie/non-free amd64 Packages [101 kB]
Reading package lists... Done                                   
W: GPG error: http://archive.debian.org/debian-security jessie/updates InRelease: The following signatures were invalid: KEYEXPIR
ED 1668892417  KEYEXPIRED 1747766513  KEYEXPIRED 1747766513  KEYEXPIRED 1747766513  KEYEXPIRED 1747766513  KEYEXPIRED 1747766513 
 KEYEXPIRED 1747766513  KEYEXPIRED 1747766513                                                                                    
E: The repository 'https://apt.readynas.com/packages/readynasos 6.10.9 Release' does not have a Release file.                    
N: Updating from such a repository can't be done securely, and is therefore disabled by default.                                 
N: See apt-secure(8) manpage for repository creation and user configuration details.                                             
W: GPG error: http://archive.kernel.org/debian-archive/debian jessie-backports InRelease: The following signatures were invalid: 
KEYEXPIRED 1587841717  KEYEXPIRED 1668891673                                                                                     
W: GPG error: http://archive.kernel.org/debian-archive/debian jessie Release: The following signatures were invalid: KEYEXPIRED 1
587841717