Need Syncing Program if You Use a VPN? Best Method?

I work in two different cities and I need to figure out the best method to organize my files and folders.

Everyone is using Google Drive, OneDrive, Resilio Sync, SyncThing, and others to sync their files over all their devices. But I don't want to do that due to 2 reasons. First, the security issues - the company itself can be looking in your files. They have the capability and I don't doubt that they have probably done so to specific people here and there. Second, it's complicated to setup. I always have issues of files syncing, file conflicts, etc.

My question is this:

If you use a VPN to connect two remote networks, do you need a syncing program at all?

For example, can you set up a large NAS at your home. And the NAS contains all your folders and files. It's basically your central drive for all your data. You create a VPN that combines your home network and a network in a different city. Now your Windows File Explorer sees everything as if everything on both networks are on the same network.

You keep all your original folders and files on the NAS and directly work off of them. (Instead of downloading them. You won't need downloading because I'm guessing the connection is fast enough?)

Would the connection between the two remote networks on the VPN be almost instaneous if you have sufficient CPU power?

I ask this because I don't have a lot of networking experience but I'm guessing it would. There would be the problem of encrypting and decrypting the data at both ends but if your NAS and computer has sufficient CPU power, it should be ok, no?

And, since it's a direct connection (ie. the 2 networks are directly connected to each other), there shouldn't be any significant lag if you have an internet service provider that has the required bandwidth and latency.

Is this setup better than any other solution out there? Or am I way off base here?

I'm asking because right now, I sync files between two remote locations and it's a huge pain because syncing causes a lot of problems like conflicts that lead to multiple copies. Thoughts of hackable security also come to mind. And syncing just all around is a more complicated setup.

*I really don't know that much about computers and networking so consider that in your response. Some of my ideas might seem really dumb but I have no IT training.

Thanks a lot for you help, guys!

The only problem with that is that don't you have to trust that their software is really encrypting your data and sending it over? The same thing happens with a VPN, no? It's encrypted but since the VPN service is doing all the work, you don't know if they are simply decrypting it and looking at your files. You simply never know and that's the problem for me. I read this and it makes a lot of sense.

Dont use VPN services. · GitHub

The problem I see is that you really can't trust anybody. I understand that you have to eventually trust in some software but it's very difficult to do so. For example, setting up a private VPN, you need to trust that Microsoft didn't put any backdoors in their window 10 software.

One solution I see is that you use encrypt the data using two different software companies. So, even if both companies are shady and are truly looking into their customer's data, they won't be able to decrypt the other shady company's encryption. Although this also has problems like what if the encryption that both companies use is not truly AES 128 but something really simple so that either computer can easily hack each other's encryption.