Scrape the date and time of the last "Completed" backup from CrashPlan's history log, for use as a Jamf extension attribute. Works on a local system, no need to query the server's API.

crashplan-date-last-backup.sh

#/bin/sh

# Grep the CrashPlan history.log.0 file for "Completed" and get the date and time
# Note: check the path of the log file for your environment
result=$(grep Completed /Library/Logs/CrashPlan/history.log.0 | tail -1 | awk '{ print $2 " " $3 }')

# Reformat CrashPlan's ad-hoc date format into a standard format
reformatted=$(date -j -f "%m/%d/%y %H:%M%p" "${result}" "+%Y-%m-%d %H:%M:%S")

# Output the result for Jamf
echo "<result>${reformatted}</result>"