Copy a single remote directory to two directories on the same machine?

Repurposing a (very) old Chromebook as a file archiver sitting in the shed at the end of my garden. Trying to create a ‘pseudo RAID’ configuration where arriving files get written both to a directory on the SD card and a directory on a USB stick, in case one or the other fails.

This doesn’t appear to be supported in the standard (syncthing-fork) interface. Is it possible, or if not is there an Android utility that will automatically mirror one directory to another? I guess I could mirror the files to a 3rd machine and have that machine forward them to the file archiver, but that seems a little complicated, hence more error prone. TIA - ChrisN.

OK, I see from an older post that this is not possible. And I’ve not found an Android utility that would mirror a folder continuously without manual intervention. Sounds like that 3rd machine is the only possibility.

You could add the same folder to Syncthing twice, then share both of them. It may not be the most efficient, but probably easier than setting up yet another computer from scratch?

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Thanks. I’ve now repurposed an old Android phone running Syncthing as a ‘loopback connector’. Files arriving on the archive server are written to a directory on the SD card, then forwarded to the phone, which passes them back to the server to be written to a directory on the USB device. It seems to work well.