Compression: please consider to add xz or another heavy algorithm

[Slow performance](https://engineering.fb.com/2016/08/31/core-infra/smaller-and-faster-data-compression-with-zstandard/) is ok for a powerful computer and when a disk is only for a backup.

<img width="736" height="400" alt="Image" src="https://github.com/user-attachments/assets/22fb2923-72a4-4448-81cb-9fd465a53aac" />