a variation of 'timemachine-mount-run-unmount.sh' meant to be used with Keyboard Maestro

km-timemachine-mount-run-unmount.sh

#!/usr/bin/env zsh -f
# Purpose: 	Once you set the DEVICE,
#			this script will mount your Time Machine drive,
#			run Time Machine,
#			and then unmount the drive
#
# From:	Timothy J. Luoma
# Mail:	luomat at gmail dot com
# Date:	2020-04-20

	## To find the device, mount the Time Machine drive and then run this command in Terminal:
	#
	#	mount | egrep '^/dev/' | sed -e 's# (.*#)#g' -e 's# on /# (/#g'
	#
	# and you will see a bunch of entries like this
	#
	#	/dev/disk2s1 (/Volumes/MBA-Clone - Data)
	#	/dev/disk3s5 (/Volumes/Storage)
	# 	/dev/disk4s6 (/Volumes/MBA-Clone)
	#
	# You need to set
	#
	#	DEVICE='/dev/disk3s5'
	#
	# or whatever is correct for your Time Machine drive

DEVICE=''




################################################################################################


if [[ -e "$HOME/.path" ]]
then
	source "$HOME/.path"
else
	PATH="$HOME/scripts:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin"
fi

zmodload zsh/datetime

TIME=$(strftime "%Y-%m-%d--%H.%M.%S" "$EPOCHSECONDS")

function timestamp { strftime "%Y-%m-%d--%H.%M.%S" "$EPOCHSECONDS" }

LOG="/tmp/km-timemachine-mount-run-unmount.$TIME.log"

STATUS=$(tmutil currentphase)

if [[ "$STATUS" != "BackupNotRunning" ]]
then
	echo "Error [`timestamp`]: Time Machine status is '$STATUS'. Should be 'BackupNotRunning'." \
	| tee -a "$LOG"

	exit 1
fi

	# if you have multiple Time Machine destinations, this might not give you the right info
	# I'm assuming you only have one
TM_DRIVE_NAME=$(tmutil destinationinfo | egrep '^Name  ' | sed 's#^Name  *: ##g' | head -1)

MNTPNT="/Volumes/$TM_DRIVE_NAME"

if [[ -d "$MNTPNT" ]]
then

	echo "$MNTPNT' is already mounted". >>| "$LOG"

else


	if [[ "$DEVICE" == "" ]]
	then
		echo "[Fatal Error]: the 'DEVICE' variable is not set" | tee -a "$LOG"
		exit 1
	fi

	diskutil mountDisk "$DEVICE"

fi

if [[ ! -d "$MNTPNT" ]]
then

	echo "[Fatal Error at `timestamp`]: Failed to mount '$MNTPNT'." | tee -a "$LOG"
	exit 1
fi

TM_DRIVE_ID=$(tmutil destinationinfo | egrep '^ID  ' | sed 's#^ID  *: ##g' | head -1)

echo "Starting backup at `timestamp`"

	# `caffeinate -i` is optional but keeps your Mac from sleeping
caffeinate -i tmutil startbackup --block --destination "$ID"

EXIT="$?"

if [[ "$EXIT" == "0" ]]
then

	echo "tmutil finished successfully at `timestamp`." >>| "$LOG"

else

	echo "tmutil failed (Exit = $EXIT) at `timestamp`." | tee -a "$LOG"

	exit 1
fi

while [[ -d "$MNTPNT" ]]
do
		# this will try to unmount the drive as long as it is mounted

	echo "Trying to unmount '$MNTPNT' at `timestamp`..." >>| "$LOG"

	diskutil unmountDisk "$MNTPNT"

	sleep 10

done

echo "Finished successfully at `timestamp`" >>| "$LOG"

exit 0
#EOF

caffeinate -i tmutil startbackup --block --destination "$ID"
pls update ID to TM_DRIVE_ID

Hi, I'm using a similar script of my own and I receive Disk Not Ejected properly for disk unmount for my TM disk. My script unmounts TM Volume when I close the lid of my MacBook. caffeinate -i, wait, sleep 5-10-15 etc don't work - macOS enters sleep earlier than diskutil unmount finishes.