[General Question] Syncing between networks

General
1

I’ve been going around the docs and this forum looking for an answer but couldn’t find it, so I apologize if my question has already been answered before.

I have 3 machines (A, B and C).
A and B are on the same local network and C is on a remote location.
Let’s assume there’s only one (same) share on each machine, what would be the better way of connecting them:

  1. C <-> A <-> B
  2. C <-> A | C <-> B
  3. C <-> A | C <-> B | A <-> B

For 2 and 3, I’m concerned that C will have to use twice as bandwidth as 1 for sending.
Also, are 2 and 3 actually different in a real-world scenario?

Thanks!

2

Syncthing naturally fetches more data from the faster peer, which in your case should be the local network. Yes, initially all bandwidth will come from C as C is the only one with the file, but over time it should shift more towards each other in the local network as they have more and more data.

3

Thanks for the quick reply.

Just to confirm that I understood correctly, on upload from C:

  • Option 1 will use x1 bw (sending only to A)
  • Option 2 will use x2 bw (sending to both A and B which are not connected to each other)
  • Option 3 will use x1.x bw (sending only some to both and the rest is sent locally)
4

Yes

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