I removed 140GB of smut and my disk is still at 80% 
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@kaia You have a powerful system. Would ZFS dedupe be useful?
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@thatbrickster probably, since I like to store a lot of identical things. does it dedup by hashes?
@kaia I believe so. Checksumming is a big part of ZFS, helped by having a mirror or raidz array to ensure data integrity.