Wow, so many weird things said so far in comments... It is absolutely a good idea, but with some minor tweaks and for the right use case. It's a great idea if

Wow, so many weird things said so far in comments... It is absolutely a good idea, but with some minor tweaks and for the right use case. It's a great idea if you want to have modern hardware that is not very expensive and predictable media that will be readable after decades. And preferably a lot of pacience due to max 125GB on each disc, or low space size requirements. Discs ain't cheap, though! For regular backups (even seldom, like half a year) I'd still go for HDDs, as they are available at around 13USD per TB. Also USB drive enclosures are as cheap as $20 so you can store them with drives. But drives will fail if you leave them with no power for a few years. But if your archive is supposed to be one time (no often archival of the same content with minor changes), or you want to store that for many years, maybe decades, discs can be the easiest reliable way. Standard discs won't guarantee longevity. They are sensitive to heat and moisture. Use m-discs for that. You can get them at 125GB for around $20 a piece. So MUCH more expensive than HDDs. But these will hold up for decades, don't mind humidity and even high heat. Compatible drives are at around $100, like Verbatim I have. There are modern ones, still. With full power via USB-c, quiet, supported by popular software. It's easy to store a drive (and even an old usff computer) in some box next to your discs, in your off-site place. I find it more likely to be usable and better chance of being available after many years, compared to, for instance, decommissioned tape drive readers that some homelabers like to use. Also much cheaper. Search for m-discs tests on YouTube. There are some hilarious tests there where a guy compares them with standard disks by leaving them outside during sun and rain for days, digging them in dirt, washing with soap like a plate, burning with cigarette lighter etc. Spoiler alert: m-discs work like charm after that. Standard ones won't even spin properly.