I was wondering the same thing recently because my nvidia captures videos took like 1 TB of space on my main PC. I wanted to compress them by switching to H265. In FFMPEG there's no simple option like "loseless compression", you always have to enter manually the bitrate or quality. Rendering a bunch of videos with different bitrates and trying to compare them to see if there's a significant differene is a really long and annoying process. I gave up and just burnt everything to bluray instead.

I bought these discs from an ebay seller:
https://www.amazon.co.jp/-/en/Verbatim-VBR520YP20SD4-Recording-Blu-ray-Printer/dp/B07YZM8Y1M/ref=sr_1_2?crid=3DS8UZ3OBIW6Z&keywords=bdxl&qid=1700868864&sprefix=bdx%2Caps%2C131&sr=8-2

The surface is covered with weird white specks, but they all worked for me. I burned them overnight at 2x speed. I checked the files with hashes and none of them had errors. I'm considering buying more since they're on sale for black friday. I do wonder what those white specks are tho.

Here are some pics I took
https://imgur.com/gallery/c1ZYs1W

With wrong with the 100GB bdxl from verbatim? I bought a 20 pack recently and they're working fine for me (so far???)

Imo buying used hard drives is worth the savings. Never had any problems.