The big cloud providers use something like erasure coding across a collection of tapes (or hard drives) to preserve information. If you've ever downloaded something from usenet and restored it with quickpar, this is basically the same idea. Every physical cartridge gets a chunk of the file. Depending on parity settings you would have to lose many tapes distributed across an arbitrary # of locations to actually lose any data.
replyNote that the hardware the big cloud providers use for tape archives is very different from the devices the GP poster appears to have used, and usually have robust verification systems.
replyIn addition the need for cloud providers to comply with userdata erasure means they have to frequently test their ability to read and write their backups - which should increase your confidence in their correctness. Yes problems can and do still happen, but IME far less often than the more traditional tape setups GP describes.
Erasure can be done much more efficiently with crypto erasure, where you encrypt the user data and just delete the key when users request deletion. This way you don't need to spend expensive tape vault / library time rewriting a tape.
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replyCan you please stop posting unsubstantive comments and flamebait? Your account has been doing a lot of this and we've asked you this before.
replySorry.
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