I kid you not, I was actually looking for a solution like that yesterday! hopefully it'll handle a few tens of gigabytes between my two Linux laptops.
- This is one file at a time. It's designed more for very quick "Oops I need that photo" sort of stuff.
  What you want to do is better served by NFS, SMB or SFTP.
  
  Or Syncthing if they want to sync gb's of files between computers.
  
  Synced many terabytes, over WiFi, Ethernet and the Internet with Syncthing. It works for all use cases, large and small.
  
  When we are talking terabytes of data there are faster ways for the initial sync job.
  I would just use rsync/sftp/robocopy or similar for that first copy for faster transfers, then setup Syncthing on those shares for delta syncs.
  
  Are you sure those are faster? The only obvious slowdown in Syncthing compared to them is the initial file scan. The file transfer saturates the pipes like any other option. If you meant the file scan overhead, then we're on the same page. ☺️
  At the same time Syncthing is ultra resilient and will auto-restart and continue syncing no matter what happens to the network connection or the hosts during transfer without intervention. This is why I stopped using rsync for initial transfers. When the initial transfer would take a week over the Internet, using Syncthing and swallowing the initial scan is nice because you don't need to look after it.
  
  Yep, with ST I can trust the files will get there. For large folders I just occasionally check on them.
  
  NFS, SMB or SFTP
  ugh.
  
  Am I allowed to think it's weird the entire open source community can't compete with SMB?
  
  SMB is a protocol that can be used with Samba software in Linux since many years, so there is no need to compete I figure. Depending on the use case, I like to use rsync for copying files across.
  
  It does actually support several files, folders, or anything.
- Use Syncthing.
  Works a breeze, does require an install on the devices, but man it just works.

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