diff -Nru anacron-2.3/debian/anacron.anacron-resume.service anacron-2.3/debian/anacron.anacron-resume.service
--- anacron-2.3/debian/anacron.anacron-resume.service	2014-12-28 19:14:52.000000000 +0000
+++ anacron-2.3/debian/anacron.anacron-resume.service	1970-01-01 00:00:00.000000000 +0000
@@ -1,14 +0,0 @@
-[Unit]
-Description=Run anacron jobs at resume
-After=suspend.target
-After=hibernate.target
-After=hybrid-sleep.target
-
-[Service]
-ExecStart=/bin/systemctl --no-block --fail start anacron.service
-
-[Install]
-WantedBy=suspend.target
-WantedBy=hibernate.target
-WantedBy=hybrid-sleep.target
-
diff -Nru anacron-2.3/debian/anacron.preinst anacron-2.3/debian/anacron.preinst
--- anacron-2.3/debian/anacron.preinst	1970-01-01 00:00:00.000000000 +0000
+++ anacron-2.3/debian/anacron.preinst	2017-05-29 16:36:12.000000000 +0000
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+if dpkg --compare-versions "$2" lt-nl 2.3-24; then
+	deb-systemd-helper purge anacron-resume.service >/dev/null
+	deb-systemd-helper unmask anacron-resume.service >/dev/null
+fi
+
+#DEBHELPER#
diff -Nru anacron-2.3/debian/anacron.service anacron-2.3/debian/anacron.service
--- anacron-2.3/debian/anacron.service	2014-12-28 19:14:52.000000000 +0000
+++ anacron-2.3/debian/anacron.service	2017-05-29 16:36:12.000000000 +0000
@@ -2,6 +2,7 @@
 Description=Run anacron jobs
 After=time-sync.target
 ConditionACPower=true
+Documentation=man:anacron man:anacrontab
 
 [Service]
 ExecStart=/usr/sbin/anacron -dsq
diff -Nru anacron-2.3/debian/anacron.timer anacron-2.3/debian/anacron.timer
--- anacron-2.3/debian/anacron.timer	1970-01-01 00:00:00.000000000 +0000
+++ anacron-2.3/debian/anacron.timer	2017-05-29 16:36:12.000000000 +0000
@@ -0,0 +1,10 @@
+[Unit]
+Description=Trigger anacron every hour
+
+[Timer]
+OnCalendar=hourly
+RandomizedDelaySec=5m
+Persistent=true
+
+[Install]
+WantedBy=timers.target
diff -Nru anacron-2.3/debian/changelog anacron-2.3/debian/changelog
--- anacron-2.3/debian/changelog	2014-12-28 19:14:52.000000000 +0000
+++ anacron-2.3/debian/changelog	2021-08-31 20:58:38.000000000 +0000
@@ -1,3 +1,24 @@
+anacron (2.3-24~16.04.sav0) xenial; urgency=medium
+
+  * Backport to Xenial
+
+ -- Rob Savoury <savoury@savos.tech>  Tue, 31 Aug 2021 13:58:38 -0700
+
+anacron (2.3-24) unstable; urgency=medium
+
+  * Team upload.
+  * Reference anacron and anacrontab man page in anacron.service
+  * Use native systemd timer unit to trigger anacron periodically.
+    When running under systemd, use a native timer unit which triggers
+    anacron.service every hour. If the system was suspended for more then
+    one hour, the timer will activate immediately on resume. The timer uses
+    a randomized delay of up to 5 minutes. This helps with not overloading
+    the system when coming out of suspend.
+    Drop anacron-resume.service, as this service is no longer necessary.
+    (Closes: #744753)
+
+ -- Michael Biebl <biebl@debian.org>  Mon, 29 May 2017 18:36:12 +0200
+
 anacron (2.3-23) unstable; urgency=medium
 
   * Team upload.
diff -Nru anacron-2.3/debian/cron.d anacron-2.3/debian/cron.d
--- anacron-2.3/debian/cron.d	2014-12-28 19:14:52.000000000 +0000
+++ anacron-2.3/debian/cron.d	2017-05-29 16:36:12.000000000 +0000
@@ -3,4 +3,4 @@
 SHELL=/bin/sh
 PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
 
-30 7    * * *   root	test -x /etc/init.d/anacron && /usr/sbin/invoke-rc.d anacron start >/dev/null
+30 7    * * *   root	[ -x /etc/init.d/anacron ] && if [ ! -d /run/systemd/system ]; then /usr/sbin/invoke-rc.d anacron start >/dev/null; fi
diff -Nru anacron-2.3/debian/rules anacron-2.3/debian/rules
--- anacron-2.3/debian/rules	2014-12-28 19:14:52.000000000 +0000
+++ anacron-2.3/debian/rules	2017-05-29 16:36:12.000000000 +0000
@@ -18,14 +18,11 @@
 	install -D -m 755 debian/apm.d debian/anacron/etc/apm/event.d/anacron
 	install -D -m 755 debian/pm-utils.power.d debian/anacron/usr/lib/pm-utils/power.d/anacron
 	install -D -m 755 debian/pm-utils.sleep.d debian/anacron/usr/lib/pm-utils/sleep.d/95anacron
+	install -D -m 644 debian/anacron.timer debian/anacron/lib/systemd/system/anacron.timer
 
 override_dh_installcron:
 	dh_installcron
 	dh_installcron --name=0anacron
 
-override_dh_systemd_enable:
-	dh_systemd_enable anacron.service
-	dh_systemd_enable --name anacron-resume
-
 override_dh_installinit:
 	dh_installinit --no-start