Why do we need encryption in the fs?

[David Niklas]

Hello, kernel newbie here,

I'm curious as to why fs'es such as ext4 need encryption in the fs,
It seems to me that we've got great support for it in tools such as
cryptsetup.
Point me to the fine manuals, I'm sure they exist.
Why not have encryption in the fs you ask, arguments against include the
inability to use recovery tools, like photorec and that backups are more
difficult this way.

Thanks, David

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