I back up everything. I use Stablebit Drivepool with duplication for all of my source code, media, photos, documents, music, books, laptop backups, etc. I back that up periodically to a Drobo DAS and 8 Bay USB enclosure setup under Drivepool. I also have off site backup (working on a new NAS which will be accessed over a VPN). I don’t want to spend the time worrying about loosing anything I have put time and effort into. Been there and done that. Drives are relatively inexpensive but can fail without warning.
Crazy idea, but if you can’t get the bandwidth to support a media server like Jellyfin or Emby where you live, what about placing a server at a trusted relatives or friends house that does have access to high bandwidth? You might need/want to help offset a better internet plan for them though. You could then setup a VPN connection to be able to manage the server remotely and sync files and media to it. You could even use it for off site backup.