diff --git a/once/update.sh b/once/update.sh
index d38ba83..748f65b 100755
--- a/once/update.sh
+++ b/once/update.sh
@@ -11,10 +11,29 @@ else
 fi
 
 for tarball in /updates/*.tar.gz; do
+	tarball="${tarball##*/}"
+
 	echo @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
-	echo extracting files from $tarball
+	echo extracting files from /updates/$tarball
+	echo ..................................................
+	tar -xpvf /updates/$tarball -C "$SYSROOT" || exit 2
+
+	echo archiving old $tarball
 	echo ..................................................
-	tar -xpvf $tarball -C "$SYSROOT" || exit 2
+
+	if [ -f /tarballs/$tarball ]; then
+		pkgsig=$(sha256sum /tarballs/$tarball)
+		pkgsig=${pkgsig%% *}
+		pkgdir=/tarballs/archive/${tarball%%.tar.gz}/$pkgsig/
+		mkdir -p $pkgdir
+		mv /tarballs/$tarball $pkgdir
+	fi
+
+	echo caching the current $tarball
+	echo ..................................................
+	mv /updates/$tarball        /tarballs/
+	mv /updates/$tarball.sha256 /tarballs/
+
 	echo ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 	echo
 done