diff -urN old/etc/initrd.scripts new/etc/initrd.scripts
--- old/defaults/initrd.scripts	2022-08-27 08:25:26.419964286 +0000
+++ new/defaults/initrd.scripts	2022-08-27 08:19:57.716641792 +0000
@@ -818,6 +818,8 @@
 	local overlay=/mnt/overlay
 	local upperdir="${overlay}/.upper"
 	local workdir="${overlay}/.work"
+	local persist="${overlay}/.persist"
+	local persist_dev=/mnt/persist
 	local static=/mnt/livecd
 
 	run_debug_shell overlayfs
@@ -832,17 +834,33 @@
 
 	mount -t squashfs -o loop,ro "${CDROOT_PATH}/${LOOPEXT}${LOOP}" "${static}"
 	mount -t tmpfs none "${overlay}"
-	mkdir "${upperdir}" "${workdir}"
+	mkdir "${upperdir}" "${workdir}" "${persist}"
+
+	if [ -n "${overlayfs_persist}" ]; then
+		if [ -n "${overlayfs_persist_dev}" ]; then
+			mkdir "${persist_dev}"
+			findmediamount "persist" "${overlayfs_persist}" "PERSIST" "${persist_dev}" ${overlay_persist_dev}
+			if [ -f "${persist_dev}/${overlayfs_persist}" ]; then
+				persist_path="${persist_dev}/${overlayfs_persist}"
+			fi
+		elif [ -n "${ISOBOOT}" ] && [ -f "/mnt/iso/${overlayfs_persist}" ]; then
+			persist_path="/mnt/iso/${overlayfs_persist}"
+		fi
+
+		if [ -n "${persist_path}" ]; then
+			mount -t squashfs -o loop,ro "${persist_path}" "${persist}"
+		fi
+	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/init new/init
--- old/defaults/linuxrc	2022-08-27 08:25:26.456630949 +0000
+++ new/defaults/linuxrc	2022-08-27 08:16:49.853314664 +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#*=}