rsnapshot no_create_root not respected in OMV 3.0

Since updating to OMV 3.0, rsnapshot's no_create_root switch isn't being respected for me; i.e. when the external USB backup drive is disconnected rsnapshot creates a directory in /media named for the absent drive's UUID and completely fills the system drive such that I can't even log into the OMV GUI.

Any suggestions how I can stop rsnapshot while the external drive is absent?

thanks

I tried the suggestion from your external link to have rsnapshot target a subdirectory rather than root of the external drive, however unfortunately no_create_root still wasn't respected.

As stopping each of my number of rsnapshot jobs is inconvenient, is there a service I could stop, even by cli?

I have installed usbbackup as you suggested. I will look at using it (in conjunction with Duplicati for more frequently changing documents).

Thanks for your help and great work.

I found what I needed to do to prevent writing to the mountpoint when the USB drive is not present was to set the immutable attribute with:
chattr +i while it was unmounted