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Delete TM protected files

/System/Library/Extensions/TMSafetyNet.kext/Contents/Helpers/bypass <rm ...>

Compare TM snapshots

tmutil compare <snapshot1> <snapshot2> | tee /tmp/backup-compare.txt

http://osxdaily.com/2012/01/21/compare-time-machine-backups-tmutil/

Find large differences between snapshots

egrep '\d+M' /tmp/backup-compare.txt
egrep '\d+G' /tmp/backup-compare.txt

Remove local snapshots to free up space (10.14.4)

tmutil thinlocalsnapshots / 21474836480 4