The high tidemark is the top of all such individual snapshot tidemarks, and is often the tidemark of the latest snapshot, but may not be. The tidemark is the top of the snapshot, and the white (free) space to the right of that shows the unused space which is available for reallocation when changing the partition. On this volume, current data is shown in black, and snapshot data in grey. The Partition symbol is used to mark the high tidemark for that volume, which sets the limit for non-destructive repartitioning of its container. Values which haven’t changed since the previous snapshot are shown in grey. As this can’t be moved, this effectively limits any resizing which might be applied to the container without destroying that snapshot. Tidemark is the highest block referenced by a snapshot. This name can be used within the parent volume’s namespace as an identifier, but may not be unique outside that.ĭate created gives the date and time at which that snapshot was created. backup are those used to build TM backups on the backup disk. local are snapshots made on the volume being backed up as the source, while. Time Machine also uses an extension to indicate the nature of that snapshot. Following that is an identifier, which may be another UUID used by the app which created and maintains it, and the date and time it was made. This is normally prefaced by the identifier of the app that made that snapshot, such as for Time Machine, or for Carbon Copy Cloner. UUID is the UUID used to identify each snapshot, and because this is unique, it’s the preferred identifier. However, it’s not guaranteed to be unique within a container or disk, so its use should be avoided where possible. XID is the numeric identifier which can be used to identify that snapshot within the parent volume’s namespace. As its Help book doesn’t provide details on the information displayed for snapshots (although there are some clues given in tooltips), this article explains a bit more about what it all means.Ĭolumns available for display, not all shown above, are the following. Disk Utility version 21.0 in macOS Monterey brings new management features for APFS snapshots.
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