Xz may had had a huge trust-related security issue but its performance is still very desiderable:

paolo@DietPi:~/Scaricati$ wget –mirror it.aleteia.org

paolo@DietPi:~/Scaricati$ du -sch it.aleteia.org/; time tar -acf ~/archivio/data/Documenti/it.aleteia.org.tar.xz it.aleteia.org/; du -h ~/archivio/data/Documenti/it.aleteia.org.tar.xz<br>37G it.aleteia.org/<br>37G totale

real 614m8,594s<br>user 469m26,287s<br>sys 15m33,329s<br>1,6G /home/paolo/archivio/data/Documenti/it.aleteia.org.tar.xz

This humble Raspberry Pi 3 may be aging and slow but it’s still useful.