Buy a season of a show (an album, a book) digitally to indicate your support and help keep it running. Then pirate and keep a local copy of the same to ensure against future unavailability, and for more convenience.
I bet enough people in the media industry understand this mechanics, and sort of turn a blind eye at it, because it's not affecting their bottom line materially.
For ebook the situation is worse but for many technical books there's a way to purchase a DRM version.
Movie/TV series is unique in a way that there's no option to buy a DRM-free version.
Obviously if your original is lower quality (say, DVD) and your pirated backup is higher quality (say, Blu-ray) then I would concede that it's piracy of the difference (i.e., you're only entitled to backups at the quality you originally purchased) which can reasonably be considered piracy in full. For simplicity, let's suppose both originals are identical releases.
If a copyright holder would consider this to be piracy, logically they should also consider it piracy if you download your digital purchase multiple times without using the same CDN point of presence each time. I'm quite certain they'd consider that a non-issue, since it all shares a common ancestor (the master for that particular release) regardless of any meaningless duplication between the master and the licensed consumer.
I suspect it won't stand because the removal of the DRM provisions that potentially allow to retract access to the media is the point of, well, backing it up.
When you buy media DRM-free, you don't have to pirate anything, you can just peacefully make a copy.
Pirate all the things.
The relationship between publishers and consumers has been almost 100% adversarial for a while, now. It started with payola for radio DJs in the 1950s, and it has only escalated since then.
PIRATE ALL THE THINGS! It is almost our duty, at this point. Publishers are closer than ever to being able to take your money and provide nothing in return if they choose. They keep inching closer and closer to that reality.
Again, this relationship is adversarial. Fight back or lose the fight forever.
Pirate. Everything.