Maybe I've got a solution
Instead of modifying backuppc behavior, I'm planning to disable
compression setting at the server and create a FUSE filesystem that
transparently compresses all the images using jpeg-xl format and put
backuppc pool on top of that.
The only problem I can think of is that every time backuppc has to do
some reading the FUSE will also need to decompress images on the fly. I
have to do some testing because my server is not much powerful, just a
dual-core system.
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