I cannot believe that I am the only one with this problem for I did not found any posts anywhere about this issue:
I found macOS Sierra doesn't create Time Machine backups until you start a login session. Leaving the Mac at the login window seems to prevent Time Machine from working. That's with all FileMaker Server 15 Macs I support but also with Macs running Server or Macs with even nothing particular added but a running web service. And it has nothing to do if the Backup target is a hard disk drive or a network share of a Mac server.
The Database directory of the FMS machines is excluded, energy saving is completely off.
I have no idea. Does anyone else have?
Regards from Hamburg,