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One way to make real-time versioned FileVault backups
Authored by: fracai on Apr 30, '09 07:51:48AM
By encrypting your data with two different algorithms and sending the result to different places you've potentially decreased your level of security. There are now an increased number of vectors of attack towards getting at your data and it's also possible that both algorithms leak information, which while useless alone, can be combined to defeat one or both schemes.

That said, this does protect you against a single source of data corruption.

I think the best option for reducing the size of encrypted backups is to encrypt each individual file. Changes to one will not affect another and thus reduce the size of the next incremental backup.

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