Easiest and most secure way? Mail (or hand deliver) a flash drive. That’s how they transfer data between super computers and data centers. (AWS even has dedicated trucks to do it)

Could send it over ATP - Avian Transfer Protocol.

Does require a USB stick and for your friend to train a pigeon though.

In one go? Look at Wormhole

But both ends must stay online until it is complete.

I would use syncthing for this

I use Syncthing for this things, you can even set a folder and keep it in sync with multiple users because it uses P2P

I tried creating my own torrent and was able to dl it on another device, but on her machine it stayed at 0% and wouldn’t let me connect to seed

At least one of the torrent clients needs to be fully connectable (port forwarded) for torrents to transfer data. You need to test that e.g. test your torrent client’s incoming connection port with a port test website like https://www.canyouseeme.org, https://www.yougetsignal.com/tools/open-ports, etc. & make sure those port test websites can successfully test connect to your torrent client’s incoming connection port. If the test fails then you need to look at opening the port via your OS firewall and/or router firewall.

Is FTP a good option? I set up a proxmox server last night but I don’t really know what I’m doing yet

Probably best to avoid FTP if you don’t know what you’re doing, it’s not all that secure… you’d want to at least configure SFTP or FTPS which is just going to be more complicated vs fixing your torrent issues. And technically you still need to make those connectable (port forwarded) too, just like your torrent client.

All that aside it’s probably easier to use Syncthing if you can’t get the torrent working.

You could also try one of those file transfer websites that use WebRTC to transfer data peer to peer e.g. https://file.pizza or similar. Not sure how well they work for huge amounts of data but their github page mentions that Firefox is better for that, apparently Chrome starts to choke with data 500+ MB.

Don’t put FTP on the Internet if you don’t know how to secure it.

If you’re relatively nearby, you could just use a flash drive. Or mail one. If not, the other comments have good suggestions.

yep, id use sftp. my mail provider (proton) also gives me like 500gb in a ‘drive’ which is great for transfers like this

Syncthing

Btw: Might be that you’re behind a NAT (router) and that’s why bittorrent doesn’t connect. You’d need to figure out which port your torrent client is configured to listen on and then do “port forwarding” of that port to your machine in the router you got from your ISP. Or use something like UPnP that does this automatically.

Not sure if that applies in your case and it’s unsolicited advice… But a fairly common issue with bittorrent.

Magic Wormhole protocol. There’s a lot of clients out there. Here’s some:

• https://github.com/magic-wormhole/magic-wormhole
• https://github.com/schollz/croc
• https://github.com/magic-wormhole/magic-wormhole.rs

There are website services where you both stay online and transfer directly.

There could be direct peer to peer transfer tools that are more robust.

If you want to go through a file transfer/hoster

• no limit https://gofile.io/
• 300 GB limit https://1fichier.com/

There’s some more, those are the top two in my bookmarks.

You’d do good of encrypting/7z-passwording if you don’t want others to see the content, just to make sure not to have to trust the hoster.

Create a multi-part archive (…probably about 250 parts…) with a strong password, upload each part to whatever the current equivalent to Megaupload is, and let them download it at their leisure.

With no accounts on either end, should only take about three months for each to be complete.

Alternatively, you could put it on a thumb drive and drive it over if they live fairly close.

I would use Resilio Sync. It uses bittorrent under the hood. https://www.resilio.com/individuals/

maybe SimpleHTTPServer (python) on the host and curl -C on the other machine?