Convert newpipe backups to m3u format
python newpipe_m3u.py /path/to/newpipe/backup/newpipe.db
python newpipe_m3u_remote.py /path/to/newpipe/backup/newpipe.db
VLC can run playlists that point to youtube urls. Alternatively, you can choose to convert it to whichever frontned you would use instead (ie: Invidious).
To keep a backup or port of your music in a straighforward and ubiquitous format like m3u. Many streaming services, android players, etc, have their own proprietary format and/or they don't give you the option to export.