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For archivers there is now writable M-Disc bluray discs which claim to have longevity of 1000 years. It might be an overexaggeration, but they do use a differen

For archivers there is now writable M-Disc bluray discs which claim to have longevity of 1000 years. It might be an overexaggeration, but they do use a different technology to record the information, a non-organic layer which is chemically much less active and will inevitably decay slower than a regular CD/DVD. There have even been some accelerated aging tests that were able to somewhat confirm that. If you're into archiving you might want to look that up.

copperx 7y ago
After looking that up I've decided it's far cheaper to upload my data to S3 with maximum data center redundancy, fund my AWS account with a big enough balance to be able to pay for a decade of service, and give my keys to people I trust.
- vbezhenar 7y ago
  You should not put all eggs into one basket. Amazon might ban your account any day and you'll end up with no data. Or your data might lost because of some bug. There's Google coldline, there's online.net C13, they have similar price. Use at least 2 different providers.
  - masklinn 7y ago
    Backblaze B2 as well, they advertise B2 at 0.5c/GB/mo, coldline is advertised at 0.4 (though the official docs quote 0.7c[0]), Glacier is 0.4 to 0.5 depending on the zone. Azure apparently has an "archive" tier for 0.1c, which you can lower even further with long-term high-volume reservation: if you reserve 1PB for 3 years it's 0.081c/GB/mo (using only local redundancy) in the cheapest DCs where it's available (some DCs either don't have that feature at all, or it's way more expensive e.g. 0.1636 in asian DCs where it's available). [0] https://cloud.google.com/storage/pricing#storage-pricing https://cloud.google.com/storage/pricing#storage-pricing
masklinn 7y ago
> For archivers there is now writable M-Disc bluray discs which claim to have longevity of 1000 years. ISO cert' states 1000 years mean lifetime (coin flip chance) but only 530 at 95% confidence. And that's at a constant 22C and 50% humidity. And that's solely for the original 4.7GB DVD, not blu-rays. > There have even been some accelerated aging tests that were able to somewhat confirm that. OTOH others (the French National Laboratory of Metrology and Testing) did not and found m-discs to be no better (and possibly worse) than other high-quality discs with an accelerated aging setup of 90C 85% humidity.

copperx 7y ago

After looking that up I've decided it's far cheaper to upload my data to S3 with maximum data center redundancy, fund my AWS account with a big enough balance to be able to pay for a decade of service, and give my keys to people I trust.

vbezhenar 7y ago
You should not put all eggs into one basket. Amazon might ban your account any day and you'll end up with no data. Or your data might lost because of some bug. There's Google coldline, there's online.net C13, they have similar price. Use at least 2 different providers.
- masklinn 7y ago
  Backblaze B2 as well, they advertise B2 at 0.5c/GB/mo, coldline is advertised at 0.4 (though the official docs quote 0.7c[0]), Glacier is 0.4 to 0.5 depending on the zone. Azure apparently has an "archive" tier for 0.1c, which you can lower even further with long-term high-volume reservation: if you reserve 1PB for 3 years it's 0.081c/GB/mo (using only local redundancy) in the cheapest DCs where it's available (some DCs either don't have that feature at all, or it's way more expensive e.g. 0.1636 in asian DCs where it's available). [0] https://cloud.google.com/storage/pricing#storage-pricing https://cloud.google.com/storage/pricing#storage-pricing

masklinn 7y ago

> For archivers there is now writable M-Disc bluray discs which claim to have longevity of 1000 years. ISO cert' states 1000 years mean lifetime (coin flip chance) but only 530 at 95% confidence. And that's at a constant 22C and 50% humidity. And that's solely for the original 4.7GB DVD, not blu-rays. > There have even been some accelerated aging tests that were able to somewhat confirm that. OTOH others (the French National Laboratory of Metrology and Testing) did not and found m-discs to be no better (and possibly worse) than other high-quality discs with an accelerated aging setup of 90C 85% humidity.