Nothing will make you happy. You want terabytes of data for free on your own private cloud. That does not exist.

How many TB do you need? Hard drives are cheap. Just get two in a mirror so if one dies you can replace it without data loss.

If you want something, you gotta pay for it. You know this, stop being a twat

At this point I expect no matter what I say, you will reject my suggestions.

You should use Google or Apple cloud and just accept your privacy loss.

It’s not error prone if you do it right. Syncing files is easy. But for your situation you might only be able to have the local NAS, which is probably good enough. You can private-cloud most things using something like NextCloud or similar.

1. local NAS syncs over WiFi.

2. House to house NAS can go slow, it will eventually get there.

Gotta have a nas at home and a nas at a friends house. Redundancy on both.

You don’t want us……

This isn’t actually a problem for the OS. They will just pull out of France.