I found pCompress as an option in the right-click menu of @radky 's BookwormPup64 10.0.7.
Never used it and thought to give it a try. It failed.
1) right-clicked the folder /boot
2) a dialog appears. I accepted all defaults and pressed "Create"
3) an error message appears
4) an empty archive /boot.tar.gz is created
Looking at the code it is obvious why the tool failed. inputdir=${inputfile%/*}
in line 28 strips the inputfile /boot to an empty string instead of stripping to the parent directory '/'.
Even if this line would be fixed, the next command in line 29 [[ $inputdir == */ ]] && inputdir=${inputdir%\/}
would "unfix" the error. This command is redundant anyway and shouldn't exist in the first place.
I would prefer to leave corrections to the author, but who is the author? And where is the forum thread? There is only a tersed "#2014" header comment in the file. IMHO this is not acceptable. I don't care for the license notice but I'm reluctant to use a tool of unknown origin.