I have node-red installed on a Synology ds215J NAS and have followed this Installation Instructions. Everything works as expected and the node-red is launched, nodes are installed and and flows are created.
Now to the question, I search where my flows are located and are expected to find flows_*.json and flows_*_cred.json in the homes folder of node-red installation.
Yes, I have a auto-start script of node-red when the NAS is restarted, where do I find that log you are refering to? But my search result should find somewhere the files if they are created