My QNAP TVS-473 also froze completely (!) several times during MARS (v1.0.3) restore of a broken WordPress site. I’m also missing the features Adrian mentions above. By the way, there’s no description on how to open .qwp-file manually. So my backups were absolutely worthless! ??
Unfortunately, MARS is nowhere near a business product as QNAP states on https://www.qnap.com/go/solution/backup-and-restoration. Looking forward to more releases to bring the solution nearer what is needed.
Regards, Fredrik Strange