It might be a few hundred to scope the main sewer line but you could probably find promos to lower the cost. There’s a “one stop shop” in my area that’s advertising scopes for $30, but they do plumbing, electrical, and HVAC and I haven’t heard of them doing any of those particularly well. If you find a company like that just be ready to put up with their sales pitch and then keep the video to run it by a different plumber for a dimebag or a case of beer or maybe even some real money.
Do you have many big trees on the property? That’s usually the biggest cause for backups like what you’re describing: roots sneak into the sewer line, then keep growing/expanding and catching all the toilet paper flowing by and then just turns into this big dumb obstruction that constipates the whole line
I’m not really a tech guy at all and I let these nerds talk me into trying Linux Mint, I haven’t bothered with Windows 10 for several months now. There was some frustrating troubleshooting at first but once the settings are tweaked how you like them, the updates don’t negate your tweaks like with Microsoft. I’m sure there’s a lot of functionality I’m not maximizing but I don’t feel the need to. I got my productivity stuff figured out, my game stuff figured out, the last thing I really need to get sorted is why my printer is being such a wiener but I use it so sparingly that there’s not much motivation to mess with that. I did dual boot for a while so I wouldn’t feel overwhelmingly stupid when it came to Linux, so I was able to familiarize myself with the new setup at my pace and that helped quite a bit I think. No harm in going that route, then you can see what happens with Warzone before fully taking the plunge