Well I am copying the Synology NAS with Hyperbackup via Rsync to a TrueNAS Core server which is in another location. In the hyper backup there is an option "Transfer encryption" which when selected the synology no longer sees the truenas server. What I've found about hyperbackup is this "
- Transfer encryption is supported only when the destination server supports encrypted network backup and the authentication password is not empty."
Which doesn't really help me much here is a link to the whole
Article .If I was trying to copy to another synology it would prompt the other synology to trust the certificate and it will go. As far as certificates the Rsync in the synology uses an SSL/TLS certificate that I've created for backup purposes that won't expire every 6 months. Also the way I am connecting to the Truenas is via DDNS, but I don't think it matters much.