I’m not sure if there’s one the best tool, depending on a case, I use mix of

• scp
• localsend
• croc
• https://github.com/dutchcoders/transfer.sh
• https://github.com/stonith404/pingvin-share
• pbcli (pastebin)
• I also have a script that sends me mail with files attached

https://www.fsarchiver.org/quickstart/ It’s faster and more efficient than just dd :)

WG Tunnel does that natively, you can whitelist some wifis and auto connect on other and optionally on mobile data