At home my MBP’s usually hooked up to an external HDD for TM backups. I have added that disk to Spotlight’s Privacy list and it does show up there whenever I plug the disk in.
But lately I’ve noticed lots of HDD activity even when TM is not backing up. I see CPU load go up a bit too and the culprit is usually one or several (more commonly) instances of mdworker. That to me indicates Spotlight is still indexing (or attempting to) my external HDD which holds just my TM backups.
I’ve tried removing the HDD from Spotlight’s Privacy list and adding it again. No difference. I should note I have the exact same setup at work and there I don’t think I observe similar behavior.
Any idea how to check if the HDD is really not being indexed? And if it isn’t, what’s up with all the disk activity and mdworker load outside of regular hourly TM backups?