My Time Machine backups are stalling (I am backing up to an external HD over USB). I discovered this three days ago. Since then I tried numerous things to get it working again, like: resetting PRAM and NVRAM Boot in Safe mode Try a different external drive Removing the inProgress file on my external HD Removing the Time Machine plist file Let Spotlight reindex There seems to be a connection between Spotlight and Time Machine. After I did a reindex, the amount of data Time Machine was going to backup increased from 2 GB to 64GB, probably due to a lot of photos I copied from a SD card two weeks ago. But this also means that my Time Machine backup hasn't been complete for two weeks. And I didn't notice it neither was there a warning (well maybe deep in the system logs but I'm not checking these on a regular basis). Not having a complete backup and me not knowing it makes I lost faith in Time Machine. If I'm overlooking something or if someone has some advice I'd like to hear it.