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I'm interested in using Blu rays (maybe M discs, which are far more expensive!) for personal backup, as I generally don't have more than 100gb of really critical data (which excludes everything I could just download on the internet), and they're said to last a long time. Blu ray readers are widely available too.

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I do use both Blurays and also some M discs with a burner for critical data. I have two burners actually and make sure each can read back the others and check on two hosts. Yes paranoid.

It’s basically between cloud like B2 backblaze and LTO tapes for many 100s of TBs. Currently using backblaze B2 and I think it’s time to bite the bullet and get two LTO drives and tapes, at least it will scale up to as big as one can imagine and then have full control and access.

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