The knowledge base does not yet contain a full answer for migrating from AFP to SMB on a Synology NAS.
What it does confirm is:
- On macOS 11.0 Big Sur and later, Apple no longer supports AFP servers, and Synology recommends using SMB instead. [9]
- For Mac file service, Synology’s older DSM guides show you enable the Mac file service / AFP server under Control Panel > Win/Mac/NFS or Control Panel > File Services > AFP, then click Apply. [1][3][10][11]
- Synology’s Time Machine guidance says that for macOS Sierra 10.12 and above, Time Machine uses SMB as the default protocol, and it recommends deactivating AFP and only using SMB for Time Machine backups. [13]
So, based on the available fragments, the supported direction is to switch Mac connections and Time Machine over to SMB, and reconfigure the related Mac Finder and Time Machine settings after the switch. The fragments do not provide a step-by-step migration procedure beyond that. [9][13]
Sources used: [1], [3], [9], [10], [11], [13]