diff --git a/README.md b/README.md
index 2a6a28f..4a9d8c7 100644
--- a/README.md
+++ b/README.md
@@ -1,19 +1,22 @@
 # MiniOS Live
+
 Этот скрипт собирает загружаемый ISO образ MiniOS.
 
-Поддерживаемые команды : setup_host build_bootstrap build_chroot build_live build_iso
+**Поддерживаемые команды:** `setup_host build_bootstrap build_chroot build_live build_iso`
+
+**Синтаксис:** `./install [start_cmd] [-] [end_cmd]`
 
 Синтаксис:
 $./install [start_cmd] [-] [end_cmd]
 $ minios-install [start_cmd] [-] [end_cmd]
->запуск от start_cmd до end_cmd
->если start_cmd опущен, выполняются все команды, начиная с первой
->если end_cmd опущен, выполняются все команды до последней
->введите одну команду, чтобы запустить определенную команду
->введите '-' как единственный аргумент для запуска всех команд
+- запуск от start_cmd до end_cmd
+- если start_cmd опущен, выполняются все команды, начиная с первой
+- если end_cmd опущен, выполняются все команды до последней
+- введите одну команду, чтобы запустить определенную команду
+- введите '-' как единственный аргумент для запуска всех команд
 
         Примеры:./install build_bootstrap - build_chroot
                 ./install - build_chroot
                 ./install build_bootstrap -
-                ./install cleanup
+                ./install build_iso
                 ./install -
diff --git a/install b/install
index 8b74319..8fbed38 100755
--- a/install
+++ b/install
@@ -7,6 +7,8 @@ set -u          # treat unset variable as error
 SCRIPT_DIR="$(dirname "$(readlink -f "$0")")"
 PARENT_DIR="$(dirname "$SCRIPT_DIR")"
 ISO_DIR="$(dirname "$SCRIPT_DIR")"
+#ISO_DIR=$SCRIPT_DIR/iso
+#ISO_DIR=/build/nfs/iso
 
 . $SCRIPT_DIR/linux-live/minioslib || exit 1
 #. $SCRIPT_DIR/linux-live/installlib || exit 1
diff --git a/linux-live/build b/linux-live/build
index f62cf58..4e0d3e0 100644
--- a/linux-live/build
+++ b/linux-live/build
@@ -70,6 +70,8 @@ for i in $MKMOD; do
 		COREFS="$COREFS /$i"
 	fi
 done
-mksquashfs $COREFS $LIVEKITDATA/$LIVEKITNAME/01-core.$BEXT -comp xz -b 1024K -always-use-fragments -keep-as-directory || exit
+mksquashfs $COREFS $LIVEKITDATA/$LIVEKITNAME/01-core.$BEXT -comp $COMP_TYPE -b 1024K -always-use-fragments -keep-as-directory || exit
 
-cd $CWD
+echo $LIVEKITDATA > /tmp/livekitdata
+
+cd $CWD
\ No newline at end of file
diff --git a/linux-live/config b/linux-live/config
index 0fd931f..681ccbb 100644
--- a/linux-live/config
+++ b/linux-live/config
@@ -21,7 +21,7 @@ SYSTEMNAME="MiniOS"
 SYSTEMVER="2021"
 
 #
-DISTRIBUTION="bionic"
+DISTRIBUTION="focal"
 
 #
 DISTRIBUTION_ARCH="amd64"
@@ -32,6 +32,9 @@ DISTRIBUTION_VARIANT="minbase"
 #
 DISTRIBUTION_URL="http://ru.archive.ubuntu.com/ubuntu"
 
+#
+COMP_TYPE="xz"
+
 # Kernel file, will be copied to your Live Kit
 # Your kernel must support aufs and squashfs. Debian Jessie's kernel is ready
 # out of the box.
diff --git a/linux-live/minioslib b/linux-live/minioslib
index 2d176ee..36ff169 100644
--- a/linux-live/minioslib
+++ b/linux-live/minioslib
@@ -12,28 +12,28 @@
 
 function common_variables() {
 	# normal
-	OUTPUT="/dev/stdout"
-	# silent
-	#OUTPUT="/dev/null"
+	# OUTPUT="/dev/stdout"
 	# log
-	#OUTPUT="/$LIVEKITNAME.log"
-
-	# Эта переменная задаётся в файле ./install
-	#ISO_DIR=$SCRIPT_DIR/iso
-	#ISO_DIR=/build/nfs/iso
+	OUTPUT="/var/log/$LIVEKITNAME.log"
 
+	# if = "1", creates a second iso with a constant filename
+	# если ="1", создаёт второй iso с постоянным именем файла
 	BUILD_TEST_ISO="1"
 
-	DEV_SYSTEM="1"
+	# if = "1", creates a copy of minios-live in chroot /opt
+	# если ="1", создаёт копию minios-live в chroot /opt
+	DEV_SYSTEM="0"
 
-	CREATE_BACKUP="1"
+	# if ="1", creates backup in parent folder
+	# если ="1", создаёт резервную копию в родительской папке
+	CREATE_BACKUP="0"
 
 	DEBIAN_FRONTEND_TYPE="noninteractive"
 	#DEBIAN_FRONTEND_TYPE="ncurses"
 
 	APT_CMD="apt"
 
-	APT_OPTIONS="-y --no-install-recommends"
+	APT_OPTIONS="-y" #--no-install-recommends"
 }
 
 # =================================================================
@@ -103,7 +103,7 @@ function help() {
 		echo -e "\tПримеры:${LIGHTYELLOW}$0 build_bootstrap - build_chroot${ENDCOLOUR}"
 		echo -e "\t\t${LIGHTYELLOW}$0 - build_chroot${ENDCOLOUR}"
 		echo -e "\t\t${LIGHTYELLOW}$0 build_bootstrap -${ENDCOLOUR}"
-		echo -e "\t\t${LIGHTYELLOW}$0 cleanup${ENDCOLOUR}"
+		echo -e "\t\t${LIGHTYELLOW}$0 build_iso${ENDCOLOUR}"
 		echo -e "\t\t${LIGHTYELLOW}$0 -${ENDCOLOUR}"
 		exit 0
 	else
@@ -129,7 +129,7 @@ function help() {
 		echo -e "\tExamples:${LIGHTYELLOW}$0 build_bootstrap - build_chroot${ENDCOLOUR}"
 		echo -e "\t\t${LIGHTYELLOW}$0 - build_chroot${ENDCOLOUR}"
 		echo -e "\t\t${LIGHTYELLOW}$0 build_bootstrap -${ENDCOLOUR}"
-		echo -e "\t\t${LIGHTYELLOW}$0 cleanup${ENDCOLOUR}"
+		echo -e "\t\t${LIGHTYELLOW}$0 build_iso${ENDCOLOUR}"
 		echo -e "\t\t${LIGHTYELLOW}$0 -${ENDCOLOUR}"
 		exit 0
 	fi
@@ -251,7 +251,8 @@ function check_mounted() {
 
 function check_build_dir() {
 	echo -e "=====> the ${CYAN}${FUNCNAME[0]}${ENDCOLOUR} function is executing ..."
-	if [ "$(ls -A $BUILD_DIR >>$OUTPUT 2>&1)" != "" ]; then
+		# ▼ должно быть только перенаправление ошибки!
+	if [ "$(ls -A $BUILD_DIR 2>>$OUTPUT)" != "" ]; then
 		echo -e "${MAGENTA}$BUILD_DIR${ENDCOLOUR} is not empty."
 		cleanup
 		check_mounted
@@ -382,7 +383,7 @@ function create_backup() {
 			mkdir -p $PARENT_DIR/minios-live-current
 			(cd $SCRIPT_DIR && cp --parents -afr * $PARENT_DIR/minios-live-current)
 		else
-			for file in $(find $SCRIPT_DIR -type f | sed "s,$SCRIPT_DIR/,,g" | sed "s,.script_version,,g"); do
+			for file in $(find $SCRIPT_DIR -path $SCRIPT_DIR/.git -prune -false -o -type f | sed "s,$SCRIPT_DIR/,,g" | sed "s,.script_version,,g"); do
 				if ! cmp $SCRIPT_DIR/$file $PARENT_DIR/minios-live-current/$file >>$OUTPUT 2>&1; then
 					CHANGED="1"
 					echo -e "$file has been modified since last backup." >>$OUTPUT 2>&1
@@ -409,21 +410,6 @@ function create_backup() {
 # =================================================================
 # =================================================================
 
-function select_distribution() {
-	# unused
-	echo -e "=====> the ${CYAN}${FUNCNAME[0]}${ENDCOLOUR} function is executing ..."
-	case $DISTRIBUTION in
-	bionic)
-		$DEBOOTSTRAP_URL=http://ru.archive.ubuntu.com/ubuntu/
-		$SOURCES_LIST=$SCRIPT_DIR/linux-live/sources/bionic.list
-		;;
-	focal)
-		$DEBOOTSTRAP_URL=http://ru.archive.ubuntu.com/ubuntu/
-		$SOURCES_LIST=$SCRIPT_DIR/linux-live/sources/focal.list
-		;;
-	esac
-}
-
 function create_apt_list() {
 	echo -e "=====> the ${CYAN}${FUNCNAME[0]}${ENDCOLOUR} function is executing ..."
 	if [ ! -f $SCRIPT_DIR/linux-live/aptsources/$DISTRIBUTION.list ]; then
@@ -437,7 +423,7 @@ function build_bootstrap() {
 	current_process
 
 	export DEBIAN_FRONTEND=noninteractive
-	debootstrap --arch=$DISTRIBUTION_ARCH --variant=$DISTRIBUTION_VARIANT $DISTRIBUTION $BUILD_DIR $DISTRIBUTION_URL >>$OUTPUT 2>&1
+	debootstrap --arch=$DISTRIBUTION_ARCH --variant=$DISTRIBUTION_VARIANT $DISTRIBUTION $BUILD_DIR $DISTRIBUTION_URL >>$OUTPUT 2>>$OUTPUT
 }
 
 function copy_build_scripts() {
@@ -551,11 +537,12 @@ function build_iso() {
 
 	B="-b boot/syslinux/isolinux.bin -c boot/syslinux/boot.cat"
 	C="-no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot"
-
-	if [ -x "$(which xorriso >>$OUTPUT 2>&1)" ]; then
+		# ▼ должно быть только перенаправление ошибки!
+	if [ -x "$(which xorriso 2>>$OUTPUT)" ]; then
 		M="xorriso -as mkisofs -isohybrid-mbr $DIR/boot/syslinux/isohdpfx.bin"
 		D=" -isohybrid-gpt-basdat -e"
-	elif [ -x "$(which genisoimage >>$OUTPUT 2>&1)" ]; then
+		# ▼ должно быть только перенаправление ошибки!
+	elif [ -x "$(which genisoimage 2>>$OUTPUT)" ]; then
 		M=genisoimage
 		D="-efi-boot"
 	else
@@ -567,8 +554,10 @@ function build_iso() {
 
 	VER="$SYSTEMNAME $VER"
 
-	if ! $M -hide-rr-moved -f -r -J -l -V "$VER" -A "$VER" \
-		$B $C $D $E -o $ISO $DIR; then
+	if
+		! $M -hide-rr-moved -f -r -J -l -V "$VER" -A "$VER" \
+			$B $C $D $E -o $ISO $DIR
+	then
 		exit 1
 	fi
 
@@ -576,7 +565,8 @@ function build_iso() {
 
 	# xorriso has hybridization built-in
 	if [ "$(echo $M | cut -d" " -f1)" != "xorriso" ]; then
-		if [ -x "$(which isohybrid >>$OUTPUT 2>&1)" ]; then
+			# ▼ должно быть только перенаправление ошибки!
+		if [ -x "$(which isohybrid 2>>$OUTPUT)" ]; then
 			isohybrid -uefi $ISO
 		else
 			echo ">>> No isohybrid to hybridize this ISO"
diff --git a/linux-live/modules/02-xorg/build b/linux-live/modules/02-xorg/build
new file mode 100644
index 0000000..e23eab4
--- /dev/null
+++ b/linux-live/modules/02-xorg/build
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+apt-get update
+apt-get install -y \
+    xorg
+    xterm \
+    blackbox
+
+savechanges /02-xorg.sb
\ No newline at end of file
diff --git a/linux-live/rootcopy/usr/bin/genminiosiso b/linux-live/rootcopy/usr/bin/genminiosiso
index 818c0ac..b386745 100755
--- a/linux-live/rootcopy/usr/bin/genminiosiso
+++ b/linux-live/rootcopy/usr/bin/genminiosiso
@@ -1,79 +1,48 @@
 #!/bin/bash
 
-CWD=$(pwd)
-SOURCE=/run/initramfs/memory
-TEMP=/tmp
-REGEX='^$'
-
-if [ "$1" = "-e" ]; then
-   REGEX="$2"
-   shift
-   shift
-fi
+. /run/initramfs/lib/config || exit 1
 
-TARGET="$(readlink -f "$1")"
+TMP=/tmp/changes$$
+EXCLUDE="^\$|/\$|[.]wh[.][.]wh[.]orph/|^[.]wh[.][.]wh[.]plnk/|^[.]wh[.][.]wh[.]aufs|^var/cache/|^var/backups/|^var/tmp/|^var/log/|^var/lib/apt/|^var/lib/dhcp/|^var/lib/systemd/|^sbin/fsck[.]aufs|^etc/resolv[.]conf|^root/[.]Xauthority|^root/[.]xsession-errors|^root/[.]fehbg|^root/[.]fluxbox/lastwallpaper|^root/[.]fluxbox/menu_resolution|^etc/mtab|^etc/fstab|^boot/|^dev/|^mnt/|^proc/|^run/|^sys/|^tmp/"
+CHANGES=/run/initramfs/memory/changes
 
-if [ "$TARGET" = "" ]; then
+if [ "$1" = "" ]; then
    echo ""
-   echo "Generate MiniOS ISO image, adding specified modules"
-   echo "Regular expression is used to exclude any existing path or file with -e regex"
+   echo "savechanges - save all changed files in a compressed filesystem bundle"
+   echo "            - excluding some predefined files such as /etc/mtab,"
+   echo "              temp & log files, empty directories, apt cache, and such"
    echo ""
    echo "Usage:"
-   echo "        $0 [[ -e regex ]] target.iso [[module.sb]] [[module.sb]] ..."
+   echo "        $0 [ target_file.sb ] [ changes_directory ]"
    echo ""
-   echo "Examples:"
-   echo "        # to create MiniOS iso without chromium.sb module:"
-   echo "        $0 -e 'chromium' minios_without_chromium.iso"
+   echo "If changes_directory is not specified, /run/initramfs/memory/changes is used."
    echo ""
-   echo "        # to create MiniOS text-mode core only:"
-   echo "        $0 -e 'firmware|xorg|desktop|apps|chromium' minios_textmode.iso"
    exit 1
 fi
 
-if [ -e "$SOURCE/data/boot/syslinux/isolinux.bin" ]; then
-   MINIOS=$SOURCE/data
-fi
-
-if [ "$MINIOS" = "" ]; then
-   echo "Cannot find boot/isolinux.bin in MiniOS data" >&2
-   exit 2
+if [ ! "$2" = "" ]; then
+   CHANGES="$2"
 fi
 
-VER=2021
-DATE=$(date +%Y-%m-%d-%H-%M)
-DIR=$MINIOS ; ISO=$TEMP/minios_$DATE.iso
-[ -n "$1" ] && ISO="$1"
+# exclude the save_file itself of course
+EXCLUDE="$EXCLUDE|^""$(readlink -f "$1" | cut -b 2- | sed -r "s/[.]/[.]/")""\$"
 
-B="-b boot/syslinux/isolinux.bin -c boot/syslinux/boot.cat"
-C="-no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot"
+CWD=$(pwd)
 
-if [ -x "$(which xorriso 2> /dev/null)" ]; then
-    M="xorriso -as mkisofs -isohybrid-mbr $DIR/boot/syslinux/isohdpfx.bin"
-    D=" -isohybrid-gpt-basdat -e"
-elif [ -x "$(which genisoimage 2> /dev/null)" ]; then
-    M=genisoimage ; D="-efi-boot"
-else
-    M=mkisofs ; D="-eltorito-platform 0xEF -eltorito-boot"
-fi
+cd $CHANGES || exit
 
-E="EFI/boot/efiboot.img -no-emul-boot"
+mkdir -p $TMP
+mount -t tmpfs tmpfs $TMP
 
-VER="MiniOS $VER"
+find \( -type d -printf "%p/\n" , -not -type d -print \) \
+  | sed -r "s/^[.]\\///" | egrep -v "$EXCLUDE" \
+  | while read FILE; do
+    cp --parents -afr "$FILE" "$TMP"
+done
 
-if ! $M -hide-rr-moved -f -r -J -l -V "$VER" -A "$VER" \
-          $B $C $D $E -o $ISO $DIR ; then
-    exit 1
-fi
+cd $CWD
 
-echo ">>> $ISO created"
-
-# xorriso has hybridization built-in
-if [ "$(echo $M | cut -d" " -f1)" != "xorriso" ]; then
-    if [ -x "$(which isohybrid 2> /dev/null)" ]; then
-        isohybrid -uefi $ISO
-    else
-        echo ">>> No isohybrid to hybridize this ISO"
-    fi
-fi
+mksquashfs $TMP "$1" -comp $COMP_TYPE -b 1024K -always-use-fragments -noappend
 
-exit 0
\ No newline at end of file
+umount $TMP
+rmdir $TMP
\ No newline at end of file