I have one Mac that sits at calculating changes and won't start copying files to the backup drive. Both the Mac and the external drive pass Disk Utility checks (repair / verify of the drive and the volume) and this machine has been happily backing up since February every few weeks when the drive is connected. This drive also has worked to back up two other Macs from time to time (both of which completed a backup with no issues three days ago).
Here is the message that gets logged when the Time Machine UI says "Calculating Changes"
com.apple.backupd: malformed base path in GetVolumeEntry
tmutil status simply shows -1 for the Percent and I expect a NumberOfDeepScannedItems to count up as the changes are "calculated".
Does anyone know if this "malformed base path" is an actual problem or can be disregarded as something not necessarily causing this issue?