Time Machine snapshots persist even though backups are current

Local snapshots are not purged every day. They accumulate till additional space is needed on the drive and then they are reduced.

I've had 117 local snapshots on one of my drives. I go to Disk Utility about once a month and remove all but the latest. I have TM backup hourly so will generate 7 or 8 local snapshots a day.

macswe wrote:

(I've really never been comfortable with my understanding of Time Machine snapshots, and stuff like this doesn't help.)

Disk Utility tells me there are two multi-GB snapshots on my boot drive -- one from 8/12, and one from yesterday (8/13) at 8:52 PM.

Time Machine tells me it's current and up to date with its backups, with the latest having happened yesterday at 9:39 PM.

Why hasn't the system purged these snapshots, or at least the older one (given that the other *might* have overlapped the backup start time)?

(Strange that there's no Time Machine, Storage, or Utilities tags in Discussions!)

I think that may be normal. My Mac has 25 snapshots visible in Disk Utility and the most recent Time Machine backup was just moments ago.