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This is easy with Syncthing. Just create a bindirectional sync and move away the data with cron.

i don't believe that will work reliably. cron risks moving a file that is not complete or a race condition where the complete file is moved away before synching verified that it is complete causing it to transfer it again. this can be avoided by only moving files that are a few minutes old but issues like this just make the process more brittle.

i want to use a tool that is reliable, not hack together a custom solution. if i did that, why even bother with syncthing?

That doesn't provide a guarantee that a file is on multiple replicas before deletion from the phone.

You could use Syncthing just to empty the incoming files from your phone (ingest) and then move the photos via cron to a second folder (also Syncthing) which is just shared with the replicas.

Another approach would be to push the files from Syncthing to borg (borgmatic can do replicas) https://torsion.org/borgmatic/

I import files from Syncthing folders into a git-annex on my NAS, where multiple copies are eventually guaranteed via sync to off-site mirrors (remotes).

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