mvaug10087 wrote:
I am finding it difficult to discover what Storagekitd actually does. Could this be an indicator of problems with the external drive?
Potentially, but not necessarily.
storagekitd is a system daemon that’s part of Apple’s StorageKit framework, which underpins a lot of what Disk Utility, Finder, and other system-level services use for interacting with storage devices.
You'll sometimes see it consuming more CPU or memory when you're doing something storage-intensive — especially when managing external drives, working with Time Machine, or interacting with encrypted volumes ...
... so seeing spikes in CPU usage in not necessarily an issue and could just be caused by lengthy Time Machine backups. However, running at a high level for 38 hrs, would be unusual and needs further investigation. I second John Galt's suggestion to run an EtreCheck report.