I'm curious, though: If I already have Time Machine set up to use AFP now, will switching to SMB be as simple as, say, marking a checkbox? Or is there an easy way to re-map an existing backup on an AFP share to an SMB share? Or will I have to start all over (losing my existing backups in the process)?
Time Machine is notoriously finicky, which is why I ask. Typically I like to test betas with features I'm anticipating, but this is a case where I'd rather not have to sacrifice 6+ months of backups.
You should just need to switch from AFP to SMB and it will use SMB instead. It's configurable from the Time Machine screen. You shouldn't lose anything.
