Around early July, several videos on the Quilt channel—including this one—were set to private. A notice was posted on the channel stating that the quilt had become an official composer for BA team could this be related to the videos being made private?
Also, Does anyone happen to have a backup file or something similar? I’d really like to keep listening to Quilt's songs.

tabi_saranghe said in comment #2613121:

Around early July, several videos on the Quilt channel—including this one—were set to private. A notice was posted on the channel stating that the quilt had become an official composer for BA team could this be related to the videos being made private?
Also, Does anyone happen to have a backup file or something similar? I’d really like to keep listening to Quilt's songs.

I have "Don't cry down my moonlight" and "Don't cry, my starlight" downloaded on my computer, they might be a little lower resolution than the original videos, but the audio is intact. I don't have premium so I can't upload them sadly.