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It can be used to store metadata that takes a long time to compute. For example, when I thought image hashing took a long time, I wrote https://github.com/barrycarter/bcapps/blob/master/imagehash.pl which stores the image hash in an xattr, so I can get to it faster after I've computed it once. However, it turns out the time savings is trivial, possibly non-existent. You could also do it with a cryptographic hash, but, unless your files are really large, you won't really save any time.
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I see that while rdiff-backup, rsync --xattr and BorgBackup (all of which I use) save the extended attributes, my online backup (SpiderOakONE) doesn't. So, that's something to take into account.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
