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In our days, it can take 10+ hours to stream all the data off a multi TB disk. A single disk can contain an amazing quantity of data, thus, it can be very valuable and sensitive.

I'd like a file system that duplicates sensitive data on the same drive. The file system data should be duplicated too, and marked in some way as to be able to reconstruct a disk after failure.

I don't need to save on space, I only need safety. And keep in mind that it takes many hours to dump a single time the contents of a disk - so, it's practically inaccessible as a whole over short periods of time.

For now, I get by with DropBox and TimeMachine but it's far from perfect. My photo collection alone is 1TB, so, no luck in backing it up in the cloud.



Use ZFS. Create a filesystem in your pool with copies=n to get n copies on the same disc.

But still use mirrors or raidz to protect against failure of a drive.


>My photo collection alone is 1TB, so, no luck in backing it up in the cloud.

Amazon glacier would store that for $10/month, though the retrieval costs if you needed to restore the whole thing are a bit more complicated.


I use BackBlaze for several hundred GB of data - and that's mostly over a 3Mb/s ADSL connection. It's been running for several years now and I can vouch for it being absolutely rock solid.




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