It looks like you're trying to backup from the server manager?
Basically, to get it working, I uninstalled the previous version and installed v5 from Shad Lords' site, per the instructions there. Because the contrib was written for 5.x, and in 6.0, Mitel changed the backup script name to do_backup, I found I had to manually expand the /sbin/e-smith/backup template. Once I'd done this, it's been working fine (I run it via cron.d once per
week).
HTH,
Des