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What's with all these hip filesystems and how are they different?
(lm.paradisus.day)
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this post was submitted on 07 Dec 2023
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I used a script that did everything for me, so I'm not 100 % sure. But as far as I know you enable the feature at mount time and then every time you copy something only a reference is copied until you actually do a change to the new or old file.
For everything else a cronjob runs every week or so to search for unnecessary duplicates.
And if a copied file is changed, btrfs only stores the difference instead of two complete files. E.g. if the 1GB file1 is copied to file2, they will take 1GB total. If 100MB is appended to file2, the total storage usage is 1,1GB