Synology Afp. Big Sur changes that the long unmaintained afp is gone with SMB being the only native file-sharing as a server option. Leaks memory and eventually drops connection. Go to your DiskStation menu button and open control panel then choose QuickConnect. Check the box Release resources immediately after disconnect if you do not check this you will get an error from Time Machine of the volume is already in use at the end of your backup and Time Machine will stick on waiting to complete first backup forever.
5192020 SMB3 is the way to go AFP has no future and has been buggy for the last 4 years already. You can attempt to force a specific connection protocol such as SMB or AFP by using a valid URL. 3282020 If the Synology is sharing using AFP instead of SMB1 it cant read it. The title says it all. Then you can ignore the fact that you are using afp. Connect to Server by either pressing K or in the Finder menu bar at the top click on Go -.
Could you explain in what context you are talking about the afp and smb addresses.
9232010 Synology and Mac Time Machine SMB or AFP. My pfSense Avahi package is set to deny only one interface VLAN90 which is an IoT network and Synology is setup to broadcast AFP and Time Machine shares. 9232010 AFP is broken on synology and everywhere else. USB disk on Synology is a hit and miss I do not recommend it it is slow like USB2 speed most of the times. Go to your DiskStation menu button and open control panel then choose QuickConnect. The title says it all.