Source : https://www.gnu.org/software/tar/
Download :
https://www.qnapclub.eu/fr/qpkg/814
About :
Actual embbeded version for tar command on Qnap is from Stone Age and have limited format support..
I bring you the version i am using every day to accellerate compression and uncompress different format like tar.xz
this version is built with pigz / unpigz, to allow tar to compress with multithreading...
you will really feel difference if your CPU has multi-core
pigz / unpigz are also added to NAS $PATH... but you can find other comrpessor like lz4 inside /opt/TarMT/bin
Why use one CPU core and lets others sleep,