Time Machine log

tm-log.sh

#!/bin/sh
# This script shows the previous 12 hours of Time Machine activity, then shows live logs
# Reference: https://superuser.com/questions/1126990/how-to-view-time-machine-log-in-macos-sierra

filter='processImagePath contains "backupd" and subsystem beginswith "com.apple.TimeMachine"'

# show the last 12 hours
start="$(date -j -v-12H +'%Y-%m-%d %H:%M:%S')"

echo ""
echo "[History (from $start)]"
echo ""

log show --style syslog --info --start "$start" --predicate "$filter"

echo ""
echo "[Following]"
echo ""

log stream --style syslog --info --predicate "$filter"