Hello Leo, In /etc/rottlog/rc the line “extension="gz"” has for only effect to expand the meta-variable “@COMP_EXT”[0] which isn't used by default. For it to be appended to every rotated log file we need to add the line “storefile @FILENAME.@COMP_EXT” to /etc/rottlog/weekly, which specify the filename for the rotated log file[1][2]. At least that's what I understand after skimming through the documentation, I have send a patch[3] but it's untested. [0]: https://www.gnu.org/software/rottlog/manual/rottlog.html#Mandatory-RC-Variables [1]: https://www.gnu.org/software/rottlog/manual/rottlog.html#Use-of-meta_002dvariables [2]: https://www.gnu.org/software/rottlog/manual/rottlog.html#Configuration-parameters [3]: https://issues.guix.info/issue/40953 Cheers, - Brice