Making a file image with compression

[Jack Dodds]

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I am trying to add zisofs compression to an existing script that
uses xorriso to make a backup ISO image (NOT incremental) of
some files and directories. I have not been able to decipher the
documentation to figure out how to do this. Specifically, the
man page seems to say that that -exec is an xorriso option and
that

- -exec set_filter --zisofs --
 
can be used to set up a compression filter. But when I do that I
get the message

xorriso : FAILURE : Not a known command:  '-exec'

Here's the present xorriso command. What I want is to compress
the files with zisofs so that the ISO image can be mounted and
files read transparently.

The OS is Debian Buster.

xorriso -outdev $BACKUPNAME/$FILENAME".iso" \
    -volid $BACKUPNAME-$BACKUPDATE \
    -not_paths /home/jack/Downloads /home/jack/Music -- \
    -not_leaf '*.iso' \
    -not_leaf '*.vdi' \
    -not_leaf 'Downloads' \
    -add /etc  /var/www  /home/jack*

Is there an example somewhere that shows how to do this?

Thanks!

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