Do people do this? Maybe, over a couple of days when you buy a few releases or box set. But some indeterminate time in the future?
I have a significant number of downloads that come with vinyl releases. Typically, these use vouchers that expire once used. So, once downloaded, the responsibility to keep a safe copy is mine. I guess I thought it was the same for all digital content.
So, the moral of the story is, when buying digital content, download it straight away, keep it safe, and enjoy the music.
Without native Linux support, they aren’t the best option for Linux / NAS users. My preferred backup tool is Borg / Pika / Borgmatic plus a Hetzner Storage Box.