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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
Have you tried syncthing? It works great with keepassxc.
Vaultwarden is pretty easy to self host.