With the network problems seemingly taken care, we were still plagued with occasional, maddening slowdowns when watching Netflix or even just browsing on our devices.
But when I shut down the iMac or put it to sleep, the network would suddenly leap to life or become more stable. Hmmm.
I've been running Backblaze since mid-January and it's still doing its initial backup, so it says. I noticed I had its performance to Faster Backup, which meant a slower network. My ignorance of Backblaze preference settings comes to the fore. Some Googling around clued me in to what I needed to do so the uploads would not affect us while we are trying to get stuff done online.
So I have set Backblaze to back up from 11pm-6am, when we're sleeping. And while it's backing up, I set it to perform faster backups -- this will saturate our little DSL line but that's OK, we're not using it at night. We have a minuscule upload rate, but I'm hoping these new settings help finish the job while not inconveniencing us.