Backup all youtube playlists from a channel into a git repo in json (https://rafaelc.org/posts/backup-your-youtube-playlists-in-json-with-git/).

backup-from-yt

#!/usr/bin/env bash
#
# Backup all playlists from a channel into a git repo in json.
#
# Dependencies:
# - jq
# - git
# - yt-dlp
#
# Copyright (C) 2021 Rafael Cavalcanti <https://rafaelc.org/dev>
# Licensed under GPLv3

set -euo pipefail

# Be sure to pass your youtube cookies to yt-dlp if
# some of your playlists are private.
###################################################
# COMPLETE THE FOLLOWING INFO
###################################################
readonly yt_user=
readonly dest_dir=
readonly branch="master"
# Use full path as it is run by a systemd unit.
readonly ydl="$HOME/.local/bin/yt-dlp"
###################################################


if [[ ! -d "$dest_dir" ]]; then
  echo "Creating destination directory..."
  mkdir -p "$dest_dir"
  git init -b "$branch" "$dest_dir"
fi
cd "$dest_dir" || exit 1

if [[ ! -d .git ]]; then
  echo "Destination directory exists and is not tracked by git."
  exit 1
fi

echo "Preparing repository..."
git stash > /dev/null
git checkout "$branch"

echo "Removing last backup jsons..."
git rm -f ./*.json

echo "Backuping youtube playlists..."
# Get list of playlists
pls_json="$($ydl --flat-playlist --dump-json "https://www.youtube.com/user/$yt_user/playlists?view=1&sort=dd&shelf_id=0")"
# Add missing "Watch Later"
pls_json+=' {"url": "https://www.youtube.com/playlist?list=WL", "title": "Watch Later"}'
readarray -t pls_titles < <(jq -r .title <<< "$pls_json")
readarray -t pls_urls < <(jq -r .url <<< "$pls_json")

for i in "${!pls_titles[@]}"; do
  pl_title="${pls_titles[$i]}"
  pl_url="${pls_urls[$i]}"

  $ydl --flat-playlist --dump-json "$pl_url" > "${dest_dir}/${pl_title}.json"
done

echo "Commiting backup..."
git add ./*.json
# Commiting directly will exit with non-zero code if no changes
git diff-index --quiet HEAD || git commit -m "Backup for $(date +%F)"

backup-from-yt.service

# Author: Rafael Cavalcanti <https://rafaelc.org/dev>

[Unit]
Description=Backup from yt
After=network.target
OnFailure=status-email@%n.service

[Service]
ExecStart=%h/Documents/Sysadmin/Backups/bin/backup-from-yt
Nice=19

backup-from-yt.timer

# Author: Rafael Cavalcanti <https://rafaelc.org/dev>

[Unit]
Description=Run backup-from-yt periodically

[Timer]
OnCalendar=weekly
Persistent=true
RandomizedDelaySec=1h

[Install]
WantedBy=timers.target