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Yes I originally wrote it for exactly this such a scenario.
This is not for you if you cannot live with any chance of a false positive, even an extremely small one. Note that even in most cases a false positive is acceptable if the chance of a false positive is less then the chance of a hardware error.
Not that just because it is probabilistic does not mean its not useful in many cases. The default setup with 1mil entrie memory and 1/1mil chance false positive chance will run at ~8M mem usage. This is a quite an acceptable trade off in many cases.
Depends on what you mean and your constraints. Deduplicate file entries if you can live with a rare false positives, sure. A setup of 1million entrie limit with 1/1billion false positive chance will get ~80M mem usage.
If you want to check for duplicate files, probably not.
> Could you use this as the deduplication method in ZFS?
I would say no.