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Tarsnap also does encryption and compression. Now you might be able to implement something like that better then cperciva, but I know I sure as hell am not capable of implementing any system as secure as reliable as him. Does this knowledge cost money? Yes. Is it worth it? Well, that depends on you.

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As does CrashPlan, and deduplication too, and it's cheaper than S3. It also runs on Solaris, Windows, etc., using file system monitoring to pick up changes.

JungleDisk does encryption and you only have to pay for S3 usage after the one-off license fee.

Is that offer still available? I was under the impression that any new subscribers had to pay a monthly fee and it had been that way for a year or more.

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