File node: how to create an uniquely named file every time the node gets data passed through it?

[Colin]

If you use a Retained topic in MQTT then that will remember it for you. Alternatively you could use Persistent Context in node-red.

A guide to understanding 'Persistent Context'

This is something I wrote up after playing with the context options. I've filed a PR with some of this added to the Node-RED documentation but thought I'd release it here also. I hope people find it useful. Paul A guide to understanding 'Persistent Context' Prior to Node-RED v0.19.0, data could be stored in context as a global, flow or node. This was stored in memory and would be reset with a restart of Node-RED. As of v.0.19.0 you can now store node, flow and global context data in memory O…

[Edit] But I like @hotNipi's idea better.