Sorry: if there is absolute maximum bit entropy that cannot be reduced to a generative function, then there can be no (lossless) compression. This is like the

Sorry: if there is absolute maximum bit entropy that cannot be reduced to a generative function, then there can be no (lossless) compression. This is like the claims of tape drive manufacturers who claimed double the capacity of the media. Pure marketing wank. If you're not already compressing and encrypting your backups, then you're not doing it right to begin with. zstd may not be the most efficient algorithm for a given dataset. There are hundreds of compressors out there. It's worth finding the best one on average for a given job and occasionally revalidating it against other candidates. PSA: Untested backups aren't backups.