RM32AI won't backup to Mac any more

RM32AI with Dante' card. Latest firmware and version of UC. Mac ruing Sierra.

Can't backup the RM32 over etheet, WiFi, or Firewire. Looks like it's going through the motions but the latest backup never shows up in the list of backups on the RM32 in UC. Checked the folder on the Mac, and there's nothing newer showing up there either, so it really doesn't appear to be getting written to the Mac. Worked good until 5/17 when the last backup is listed.

A factory reset of the RM32 restored the backup capability last time, but I'd rather not lose the scenes I have created since the last successful backup.