read 'info tar' and found under Multi-Volume Archives

   `--info-script=SCRIPT-NAME' (`--new-volume-script=SCRIPT-NAME', `-F
SCRIPT-NAME') is like `--multi-volume' (`-M'), except that `tar' does
not prompt you directly to change media volumes when a volume is
full--instead, `tar' runs commands you have stored in SCRIPT-NAME.  For
example, this option can be used to eject cassettes, or to broadcast
messages such as `Someone please come change my tape' when performing
unattended backups.  When SCRIPT-NAME is done, `tar' will assume that
the media has been changed.

So it looks like you can create a script that will rename the different archives
at the change of each volume.

Roderick wrote:
> 
> Hello,
> When using tar -cMf ...      (Multi Volume), can you change the archive
> name at each change of volume?
> Thanks,
> Rod
> 
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