both seem fairly important in the 40-years-ago world concerning the 't'(ape) part of tar but okay. I use them frequently as an "rsync"-ish into the archive fil

both seem fairly important in the 40-years-ago world concerning the 't'(ape) part of tar but okay. I use them frequently as an "rsync"-ish into the archive file, which I can then use to take point-in-time snapshot/backups.