See also the Debian jigdo page

jigdo-lite writes

If you already have a previous version of the CD you are
downloading, jigdo can re-use files on the old CD that are also
present in the new image, and you do not need to download them
again. Mount the old CD ROM and enter the path it is mounted under
(e.g. `/mnt/cdrom').

Here you can enter something like

/mnt/DVD/dvd[1-3]

Download all Debian 7.11 CD's

mkdir cd-7.11; cd cd-7.11; for i in {1..67}; do wget http://cdimage.debian.org/cdimage/archive/7.11.0/i386/jigdo-cd/debian-7.11.0-i386-CD-$i.jigdo; done 
mkdir cd-7.11; cd cd-7.11; for i in {1..67}; do wget http://cdimage.debian.org/cdimage/archive/7.11.0/i386/jigdo-cd/debian-7.11.0-i386-CD-$i.template; done
for i in {1..67}; do jigdo-lite --noask debian-7.11.0-i386-CD-$i.jigdo; done

First check in https://cdimage.debian.org/debian-cd/current/amd64/jigdo-dvd what the current verion number is

for i in {1..3}; do wget https://cdimage.debian.org/debian-cd/current/amd64/jigdo-dvd/debian-10.9.0-amd64-DVD-$i.jigdo; done
for i in {1..3}; do wget https://cdimage.debian.org/debian-cd/current/amd64/jigdo-dvd/debian-10.9.0-amd64-DVD-$i.template; done
for i in {1..3}; do jigdo-lite --noask debian-10.9.0-amd64-DVD-$i.jigdo; done

Download the first 3 Debian 8.11.1 DVD's

mkdir dvd-8.11.1
cd dvd-8.11.1
for i in {1..3}; do wget http://cdimage.debian.org/cdimage/archive/8.11.1/amd64/jigdo-dvd/debian-8.11.1-amd64-DVD-$i.jigdo; done 
for i in {1..3}; do wget http://cdimage.debian.org/cdimage/archive/8.11.1/amd64/jigdo-dvd/debian-8.11.1-amd64-DVD-$i.template; done
for i in {1..3}; do jigdo-lite --noask debian-8.11.1-amd64-DVD-$i.jigdo; done

Manually download the SHA512SUMS file(s)
When done you can calculate the SHA512SUM of the .iso files and compare them with the value in the SHA512SUMS file(s)
To use the program below first rename the SHA512SUMS file(s) to

SHA512SUMS.[iso filenename without "-#.iso"].txt

# is the sequence number of the disks. Examples

SHA512SUMS.debian-10.9.0-amd64-DVD.txt
SHA512SUMS.firmware-10.9.0-amd64-DVD.txt 

#! /bin/bash
for i in $(ls -1 *.iso); do
  echo "Checking file $i"
  sha512sumCalculated=$(sha512sum $i | cut --delimiter=' '  --fields=1)
  echo -e "The SHA512 sum of $i is:\n$sha512sumCalculated"
  echo -e "The SHA512 sum should be:\n$(grep .iso *.txt | tr -s ' ' | sort --key=2 --field-separator=' ' --unique | grep $i | cut --delimiter=: --fields=2 | cut --delimiter=' ' --fields=1)"
  if [[ $(echo $sha512sumCalculated | cut --delimiter=' ' --fields=1) == $(grep $i SHA512SUMS*.txt | cut --delimiter=: --fields=2 | cut --delimiter=' ' --fields=1 | sort --unique) ]]; then
    echo "SHA512 sum matches for $i"
  else
    echo "ERROR: SHA512 sum differs for $i"
  fi
  echo -e "\n"
done

Download files from the Internet

wget http://mirror.nl.leaseweb.net/speedtest/1000mb.bin

https://cdimage.debian.org/cdimage/archive/8.11.1/amd64/jigdo-dvd/ for i in {1..3}; do wget https://cdimage.debian.org/cdimage/archive/8.11.1/amd64/jigdo-dvd/debian-8.11.1-amd64-DVD-$i.jigdo; done

Do not make backups of already downloaded files. Only update the existing files use --mirror. --mirror is equal to

--recursive --timestamping --level inf --no-remove-listing

somewebsite.tld example: www.debian.org

cd pathToWhereToDownloadTo
wget --mirror --backups=0 --tries=10 -o ./somewebsite.log --page-requisites --html-extension --convert-links --domains=somewebsite.tld somewebsite.tld

Explanation:

--convert-links: After the downloading convert the links in the document to make them suitable for local viewing
--domains somewebsite.tld: do not follow links outside somewebsite.tld
--html-extension: save files with the .html extension.
--level inf: Specify recursion maximum depth level depth. inf = infinite
--no-clobber: don't overwrite any existing files (used in case the download is interrupted and resumed).
--page-requisites: get all the elements that compose the page (like CSS and images)
--recursive: download the entire website
--timestamping: Turn on time-stamping
--directory-prefix=/mnt/ramdisk/ : Save files in /mnt/ramdisk/

Other, maybe useful, options

--no-parent: do not follow links outside the directory somewebsite.tld
--no-remove-listing: Don't remove the temporary .listing files generated by FTP retrievals
--restrict-file-names=windows: modify filenames for use in Windows

wget https://www.podcasts.nl/somename;  grep --extended-regexp --only-matching \
"(http|https)://[a-zA-Z0-9./?=_%:-]*mp3" somename | uniq | xargs wget

wget on Windows
Installation:

• Goto https://sourceforge.net/projects/gnuwin32/files
• Scroll down to wget
• Click on wget
• Scroll down to 1.11.4-1 or a newer version
• Click on 1.11.4-1 or a newer version
• Scroll down to wget-1.11.4-1-setup.exe
• Click on wget-1.11.4-1-setup.exe
• Wait for the 5 seconds to finish
• Save the file in This “PC > Downloads”
• Open a 'Command prompt' window
• Do c:\users\yourusername\downloads\wget-1.11.4-1-setup.exe
• Click on 'Yes'
• Click on 'Next
• Select 'I accept the agreement
• Click on 'Next'
• Click on 'Next'
• Select 'Binaries' and 'Documentation'
• Click on 'Next'
• Click on 'Next'
• Click on 'Next'
• Click on 'Install'
• Click on 'Finish'

Using wget

• cd “c:\program files (x86)\GNUWin32\bin”
• Run wget https://pagetodownload.html
• There is an SSL error. To be solved

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