With drupal 8-9 the
drush ard command is dead. The King is dead long live
drush sql:dump with
zip or tar or whatever command you use for archiving - compressing your files.
So for SQL dump archive - database backup file with compression
drush sql:dump --gzip > db.gzip
Official Documentation:
https://drushcommands.com/drush-9x/sql/sql:dump/
For archiving the web root (project directory)
zip -rXq d8project.28052020.zip d8project/.
X: for Mac users hides all the unnecessary _MACOSX, ._Filename & .DS_Store files.
q: (quite) compress files and directories without turning your terminal screen into a matrix screen.