https://github.com/schollz/croc

It's similar to magic wormhole if you've heard of that, but a bit more polished. I think for me it offers the best possible UX.

transfer.sh is also good if you can't install these for whatever reason.

We've transferred as much as 250 GB I believe using scp over the local network. But that was obviously between roommates.

You're probably right that once you're in the TB range, actually sending a drive is the way to go. Egress on Amazon is more expensive than buying and then shipping physical disks.

And you can run your own portal, code and instructions here: https://github.com/NebulousLabs/skynet-webportal (roughly a weekend of work to set one up at this point)

https://flathub.org/apps/details/com.sireliah.Dragit

It's relatively simple p2p app with host auto-discovery. Payload is encrypted and performance is pretty decent. Built using rust, libp2p and gtk.

Edit: works on Linux and Windows; repo is here: https://github.com/sireliah/dragit

https://filesender.org/ looks promising but I have not had the time to look into it yet.

The hardest part is being able to have a domain name that links to my machine. After that Caddy makes everything extremely simple.

  - password protection 
  - number of days availability (1 day - 4 weeks) 
  - max number of downloads
  - european datacenter 
  - max 4GB

Depends on if people you are send are online at the same time. If they are not online at the same time, you would need some in-between services. Or else you can just rsync the files between you guys.

https://cryonet.io

Shameless plug I'm the dev and using it daily :)

Note: I'm obviously thinking from a user perspective, I'm sure others, especially non-technical people might find this reasonable. From a business perspective I suppose it does make sense.

In addition to sending files, I can request files from a third party. Includes document signing and payments (which I've not used).