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There is also a rmt-dump command.

Does that exist with a clean install? I can't even find an installable package for Debian/Ubuntu.

There is also a rmt-dump command.

Does that exist with a clean install? I can't even find an installable package for Debian/Ubuntu.

apt-file search rmt-dump

rmt is a prefix. The command is implemented by whichever package wants to provide it. rmt-tar is part of the tar package, rmt-dump is part of the dump package.

From rmt-dump manpage:

NAME
       rmt - remote magtape protocol module

SYNOPSIS
       rmt

DESCRIPTION
       Rmt is a program used by the remote dump(8), restore(8) or tar(1) programs in manipulating a magnetic tape drive through an interprocess communi‐
       cation connection.  Rmt is normally started up with an rexec(3) or rcmd(3) call.

       The  rmt  program accepts requests specific to the manipulation of magnetic tapes, performs the commands, then responds with a status indication.
       All responses are in ASCII and in one of the following two forms.

I think it's okay to not implement this, since the actual installations might be rare.

Also, rmt is symlinked to rmt-tar.