It seems that all these microservices[1] are there for the sake of blogging about using microservices[2] as there haven't been any new significant new features delivered in years, and the whole application now seems to be delivered through AJAX calls.
[1]: https://developers.soundcloud.com/blog/building-products-at-... [2]: http://philcalcado.com/2015/09/08/how_we_ended_up_with_micro...
https://rg3.github.io/youtube-dl/
I know you mentioned originals are only accessible through the web interface, but I was not sure if you were aware of the JSON API.
I'm not afraid to loose what I created. 8 years ago, I lost 200 tracks. When I realized it, I decided consciously to make it a good experience, no grief at all.
I found it to be a formidable opportunity to start fresh, change my process, change my habits and create more!
EDIT: Its on my to do list to write a pipeline for Soundcloud for Archive Team this weekend. Just in case. That doesn't pickup private tracks though. Backup your stuff!!