Find all html files in /usr/share/doc and pass this output to cpio with verbose option:
find /usr/share/doc -type f -name '*.html' | cpio -ov > backup.cpio
Create a restore directory and switch to it:
mkdir restore && cd restore
Using cpio - passing as input previous backup.cpio file: restore the contents by creating target directories and using relative filenames:
cpio -idv --no-absolute-filenames < ~/backup.cpio