>>> Is there any reason why xz compression is not (yet) supported? >> It is, see "lzma". > At least on Linux, lzma is different from xz. https://docs.python.org/3/library/lzma.html Search for XZ on that page. The default format is what we use. -- GPG ID: FAF7B393 GPG FP: 6D5B EF9A DD20 7580 5747 B70F 9F88 FB52 FAF7 B393