Problem: Even though I haven't done many file changes the Time machine incremental backup is about 350 MB per flush (resulting in many GB per day for hourly backups). I don't generate THAT much work each day.
Using Time Machine and Time Tracker to track down the culprits.
global-messages-db.sqlite (170.5 MiB)
urlclassifier3.sqlite (50.6 MiB)
Cache 78.2 (MiB)