>By uploading Your Content to the Platform, you also grant a limited, worldwide, non-exclusive, royalty-free, fully paid up, license to other users of the Platform (...) to use, copy, listen to offline, repost, transmit or otherwise distribute, publicly display, publicly perform, adapt, prepare derivative works of, compile, make available and otherwise communicate to the public

At least I read this only as "by default you are granting all users permission to do whatever you like", then you can restrict the access rights according to next part.

>You can limit and restrict the availability of certain of Your Content to other users of the Platform, and to users of Linked Services

I'd guess there are still plenty of stuff to backup even if some artists/performers/bands use more restrictive licensing.