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A comment on Show HN: Minimalist App for Backups to Any Storage. Parent comment

Re:Show HN: Minimalist App for Backups to Any Storage by bimbashrestha on Sunday November 22, 2020 @11:02PM (#25183457)
It uses a custom algorithm and data format but uses a similar deduplication technique to restic. There is bit of info in the docs page about this [1].

[1]: https://blobbackup.com/docs.php#data-format

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Re:Show HN: Minimalist App for Backups to Any Storage by arkadiyt on Sunday November 22, 2020 @11:42PM (#25183662)
> Blob file names are the SHA256 hash of the unencrypted blob contents

Obviously this is needed to make block level deduplication possible, but it also means that for this "end to end encrypted" product someone can still tell whether or not you own a given file. This is probably fine for most people but worth calling out.

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Re:Show HN: Minimalist App for Backups to Any Storage by bimbashrestha on Monday November 23, 2020 @12:19AM (#25183821)
Good catch. But the SHA hash is salted per backup destination though. So you can't figure out the content from the hash alone.

EDIT: I should make note of that on the docs page really. It currently gives the impression that I'm just straight up calculating the sha of the content.

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