Hi Dutchbird,
That is not fun at all. I'm sorry to hear it. I had my fair share of those situations in the past three decades of working digitally. Never lovely; no one enjoys this!
Yes, I will talk to someone about this in tech support so they give a document with the side effects of the treatment that they shared in the future. This needs to be known.
So, let me open this can of worms, as I'm used to it ;-), which is also what I would ask any friend of mine with that kind of description: (I assume you know all of that, but just in case)
Your Time Machine is not working; Redshift is not working: What else? (Rhetorical question).
Could it be that something bigger is happening that needs a more global inspection? Apple has remote checks for computers; try it. Back up first.
https://support.apple.com/en-us/HT202731
I do backups manually, not compressed; yes, it takes way more space. But with a Harddrive being around $20/TB, that is not a thing I would think about for a second. For the internal backup, I use an SSD with 2.8 Gb/s; it is super fast—nearly no interruption. Yes, Timemachine is more comfortable.
Something is off, and Disk Utility should be used to see if there is something with your drives. Again, I'm not supposed to give tech support here, so I have already said too much.
Fingers crossed.