I shuffled my home directory around and moved it back to my spinning platter drive in my MacBook. Ever since, Time Machine has been running my machine hot (the fan comes on when Time Machine starts up) and the backup data size estimates shown by Time Machine in the menu bar are huge. Many gigabytes.
But when I inspect the completed backups with BackupLoupe the actual backup size is very, very small.
This wouldn't bother me so much if it weren't for the fact that Time Machine runs my machine very hot when it runs, occupies a fair bit of CPU and takes a good 20-30 minutes to complete the hourly backup run now.
My complete exclusion list for Time Machine is currently:
~/Library/Application Support ~/Documents/Virtual Machines.localized ~/Virtual Machines
~/Library/Application Support on a hunch that it might be time stamp issues on cache files that end up having no change in in their bits. But TM is still saying it's backing up >2 GB of data.
Ultimately I'd like to trim the amount of time Time Machine spends running on my machine. Currently it's spending upwards of 30 minutes every hour spinning on these backups.
Why is Time Machine's reported effort in the tool bar so much higher than the actual backup contents as reported by BackupLoupe? Is one of them wrong? Which one?
How can I help guide Time Machine in it's estimate of what needs to be backed up so it doesn't have to work so hard?