The current DNS server is just set to the IP address of my Gateway, which I don’t think has had any significant changes to its settings since the ISP delivered it. OMV is currently able to check for updates and all internet-related operations on the machine so far have been working perfectly as expected - except, of course, for the pulling issue described above.
My current plan, after seeing the other comment about the limitations of the Docker version of HomeAssistant, is to essentially wipe the drive I’m currently running OMV on, install HomeAssistant OS overtop it, and then try to make HAOS to the jobs I used OMV for. In case that doesn’t work I’m going to be making a disc image backup of how the OS drive currently is (Drive is 250GB, I have a spare 1TB external SSD) and disconnecting the other drives until I’m confident in the HAOS solution. That way I should at least be able to revert things to how they are now and use HAOS on another machine if I need to.
Thank you (and the others) for trying to help.
I’m not sure how to stop the DAC from shutting down when Mint goes to sleep, but maybe you can avoid the problem by making Mint not go to sleep in the first place? There’s an option for it in the System Settings program, in the “power management” menu (under the “Hardware” heading).
Try doing that and see if the problem keeps happening. If it keeps happening, the DAC shutting down was probably caused by something else.