diff -urN old/defaults/initrd.scripts new/defaults/initrd.scripts
--- old/defaults/initrd.scripts	2022-08-29 02:54:00.979978613 +0000
+++ new/defaults/initrd.scripts	2022-08-29 03:13:30.209940026 +0000
@@ -326,6 +326,24 @@
 	findmediamount "cdrom" "${SUBDIR}/${CDROOT_MARKER}" \
 		"REAL_ROOT" "${CDROOT_PATH}" ${DEVICES}
 
+	if [ -n "${overlayfs_persist_dev}" ]; then
+		persist_dev=/mnt/persist_dev
+		mkdir "${persist_dev}"
+		findmediamount "persist" "${overlayfs_persist}" \
+			"PERSIST" "${persist_dev}" ${overlayfs_persist_dev}
+	elif [ -n "${overlayfs_persist}" ]; then
+		if [ -f "${CDROOT_PATH}/${overlayfs_persist}" ]; then
+			persist_dev=${CDROOT_PATH}
+		elif [ -n "${ISOBOOT}" ] && [ -f "/mnt/iso/${overlayfs_persist}" ]; then
+			persist_dev=/mnt/iso
+		else
+			persist_dev=/mnt/persist_dev
+			mkdir "${persist_dev}"
+			findmediamount "persist" "${overlayfs_persist}" \
+				"PERSIST" "${persist_dev}" ${DEVICES}
+		fi
+	fi
+
 	if [ "${VERIFY}" = '1' ]
 	then
 		cd "${CDROOT_PATH}"
@@ -407,6 +425,18 @@
 				run rm -rf ${NEW_ROOT}/mnt/livecd.* 2>/dev/null
 				run rm -rf ${NEW_ROOT}/mnt/image.* 2>/dev/null
 				run rm -rf ${NEW_ROOT}/mnt/zisofs 2>/dev/null
+			elif [ -n "${overlayfs_persist}" ] && [ -n "${persist_dev}" ]; then
+				good_msg "Copying persist file for caching ..."
+				# Verify that the needed directory exists
+				run mkdir -p "$(dirname ${NEW_ROOT}/mnt/${overlayfs_persist})"
+				run cp -a ${persist_dev}/${overlayfs_persist} ${NEW_ROOT}/mnt/${overlayfs_persist}
+				if [ $? -ne 0 ]
+				then
+					warn_msg "Failed to cache the persist file! Lack of RAM?" 0
+					run rm -rf ${NEW_ROOT}/mnt/${overlayfs_persist} 2>/dev/null
+				else
+					persist_dev=${NEW_ROOT}/mnt
+				fi
 			fi
 		fi
 	fi
@@ -818,6 +848,7 @@
 	local overlay=/mnt/overlay
 	local upperdir="${overlay}/.upper"
 	local workdir="${overlay}/.work"
+	local persist="${overlay}/.persist"
 	local static=/mnt/livecd
 
 	run_debug_shell overlayfs
@@ -830,19 +861,27 @@
 	run modprobe overlay >/dev/null 2>&1
 	checkfs overlay
 
-	mount -t squashfs -o loop,ro "${CDROOT_PATH}/${LOOPEXT}${LOOP}" "${static}"
+	if [ -f "${NEW_ROOT}/mnt/${LOOP}" ]; then
+		mount -t squashfs -o loop,ro "${NEW_ROOT}/mnt/${LOOP}" "${static}"
+	else
+		mount -t squashfs -o loop,ro "${CDROOT_PATH}/${LOOPEXT}${LOOP}" "${static}"
+	fi
 	mount -t tmpfs none "${overlay}"
-	mkdir "${upperdir}" "${workdir}"
+	mkdir "${upperdir}" "${workdir}" "${persist}"
+
+	if [ -n "${overlayfs_persist}" ] && [ -n "${persist_dev}" ] && [ -f "${persist_dev}/${overlayfs_persist}" ]; then
+		mount -t squashfs -o loop,ro "${persist_dev}/${overlayfs_persist}" "${persist}"
+	fi
 
 	is_union_modules overlayfs
-	run mount -t overlay overlay -o lowerdir="${static}${mod_path}",upperdir="${upperdir}",workdir="${workdir}" "${NEW_ROOT}"
+	run mount -t overlay overlay -o lowerdir="${persist}:${static}${mod_path}",upperdir="${upperdir}",workdir="${workdir}" "${NEW_ROOT}"
 
 	[ ! -d "${NEW_ROOT}${overlay}" ] && mkdir -p "${NEW_ROOT}${overlay}"
 	[ ! -d "${NEW_ROOT}${static}" ] && mkdir -p "${NEW_ROOT}${static}"
 
-	echo "overlay / overlay defaults 0 0" > "${NEW_ROOT}"/etc/fstab
+	[ ! -f ${persist}/etc/fstab ] && echo "overlay / overlay defaults 0 0" > "${NEW_ROOT}"/etc/fstab
 
-	for i in "${overlay}" "${static}"
+	for i in "${overlay}" "${static}" "${persist}"
 	do
 		run mount --bind "${i}" "${NEW_ROOT}${i}"
 	done
diff -urN old/defaults/linuxrc new/defaults/linuxrc
--- old/defaults/linuxrc	2022-08-29 02:54:01.016645277 +0000
+++ new/defaults/linuxrc	2022-08-29 02:54:06.929978416 +0000
@@ -429,6 +429,13 @@
 				overlayfs_dev=${x#*=}
 			fi
 		;;
+		# Allow user to specify persistent image on top of image.squashfs
+		overlayfs_persist\=*)
+			overlayfs_persist=${x#*=}
+		;;
+		overlayfs_persist_dev\=*)
+			overlayfs_persist_dev=${x#*=}
+		;;
 		# Allow user to specify the modules location
 		overlayfs.modules\=*)
 			overlayfs_modules_dir=${x#*=}