NAS to NAS not backing up

[ed]

Yago, it seems like you're encountering some connectivity hurdles between your DS923+ and DS1821+ Synology NAS devices while attempting to set up Hyper Backup. Let's troubleshoot this together. First off, ensure that both NAS systems are running the latest firmware updates. Next, let's double-check the network settings on both devices, making sure they're on the same LAN and that there are no firewall or network segmentation issues causing communication barriers. When configuring Hyper Backup, ensure that you're using the correct destination server IP, along with the appropriate port number. For Synology NAS devices, the default ports for Hyper Backup are typically 6281, 5000, or 5001. If you're still encountering issues, try disabling any security or firewall settings temporarily to see if that resolves the problem. If the issue persists, consider reaching out to technical support for further assistance.

https://kb.synology.com/en-my/DSM/tutori...per_Backup