I have a zvol with several datasets on it, and I initially set up half-hourly snapshots recursively on it, to be kept for 2 months. These were duly made, but I ran into problems (with the Time Machine doing the backup all over again issue) which led to one of the datasets with a quota getting full. Therefore I destroyed all but the previous few days' snapshots, reset the time to keep snapshots to 2 weeks and saved the snapshot task. It is now more than two weeks and no snapshots have been...
Regular snapshot deletion problem.
Regular snapshot deletion problem.