Grumpydaddy

I need some advice, or at least pointers on where to go to learn more. I have been considering adding some type of backup to my network. Here is what I would like to be able to do:

1. Primarily, back up my devices, whether that be desktops, laptops, or mobile, preferably automatically, regardless of OS. I have Windows, android, and Linux in the house and would like to have the devices automatically back themselves up each night.

2. Possibly stream audio, video, and images (images to a photo frame would be cool).

3. any cool other stuff I may imagine such as more server type stuff like home automation, password vault, and anything else applicable that I haven't thought of yet. I currently have a RaspberryPi 4 running Pihole. I know I could easily add more services to this device if needed.

So I was thinking of getting a 4 bay NAS but a dedicated Synology box is going to cost me at least a grand. Would I get more flexibility AND save money by buying a N100 machine? Would this give me a machine that can be both a server AND a NAS? Can I duplicate the Synology software with FOSS? I don't know much about NAS boxes but they seem expensive for what you get.

I have no plans to expose this to the internet so security is perhaps less important to me.

Thanks in advance and please add whatever you advice or comments you may have about the best way to set this up. Again, the system is designed primarily as backup but it would be nice for it to be able to other things as well. Backing up the mobile devices is of prime concern and I'm not sure how that would be accomplished regardless of what direction I take, so any info on that would be helpful.

Thanks

Kind of an ELI5, but I tune a radion into a specific frequency to listen to a station. If that frequency is constantly being modulated (changed), how is the radio not going in and out of tune? I expect it is finding a way to measure multiple frequencies around the tuned station and decodes the data from it's deviation from the tuned frequency?

I'm trying to understand what's happening in this circuit:

I------------------T1 (+333V)
I                 I
I                 R1(10K)
(pos)             I
1000V             I------------gnd (0V)
(neg)             I
I                 R2(10K)
I                 I
I                 IT2(-333V)
I                 I
I                 R3(10K)
I                 I
I-----------------IT3 (-666.7V)

I am learning basic DC theory from reading and sometimes I come across something I'd like to ask a question about, so:

1. In the above circuit, without the ground, the voltage across all components would begin at 10V and finish at 0V. By adding a ground, I'm basically saying "here is 0V" and everything gets redefined in reference to that point and I end up with a 10 volt circuit with +3.33 as it's highest voltage and -6.667 as it's lowest.

2. The electrons could care less, they still flow from the anode to the cathode of the battery under normal conditions, going from the highest potential to the lowest.

3. This example was only used to demonstrate voltage dividers. It revolved around worker protection present in aluminum processing. Each machine is in series and mobile grounds are used nearest the machine a worker is using. I assume that this allows the worker to have the least exposure to electrical shock as they are also at ground potential?

I actually think working though these questions has cleared everything up, but please, comment on anything I got wrong.

Also, sorry about the crappy drawing, the autowrap in this editor really made things tough to format

Thanks!