The answer by tubedogg to question Reuse Time Machine backup drive after migration to new machine described a procedure to do this. It didn't address this issue:

JT-imac:/Users/jt>> sudo tmutil associatedisk -a "/Volumes/Macintosh HD" "Volumes/IoTMBU/Backups.backupdb/Latest/Macintosh HD"
/Users/jt/Volumes/IoTMBU/Backups.backupdb/Latest/Macintosh HD: Not a snapshot volume.

Stupid typo or fouled up TM BU drive?

  • Typo. You're missing a forward slash; "Volumes/IoTMBU… should be "/Volumes/IoTMBU…. – duskwuff -inactive- Sep 1 '17 at 17:53

You're missing a / from the start of your second path, so it's looking in the current directory for Volumes, as shown by the error "/Users/jt/Volumes/…". Add a / to the start of the second path.

  • Added it, but same message:-( – J T Sep 1 '17 at 22:07
  • @JT Exactly the same or can you paste the new command and response into your question a second time? – grg Sep 1 '17 at 22:34
  • sudo tmutil associatedisk -a "/Volumes/Macintosh HD" "/Volumes/IoTMBU/Backups.backupdb/Latest/Macintosh HD" Password: /Volumes/IoTMBU/Backups.backupdb/Latest/Macintosh HD: Not a snapshot volume. JT-imac:/Users/jt>> – J T Sep 1 '17 at 23:17
  • drive had been named "Iomega TM BU" - changed name back again but no change even after eject and re-attach. – J T Sep 1 '17 at 23:22
  • thanks everyone, but I gave up and reformatted, losing my history:-( – J T Sep 2 '17 at 21:16

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