diff --git a/.config/bash/module/Archive.sh b/.config/bash/module/Archive.sh
index 8c5f5e6..3df10c2 100644
--- a/.config/bash/module/Archive.sh
+++ b/.config/bash/module/Archive.sh
@@ -26,6 +26,35 @@ function archive() {
 	_iterate_targets process ${targets[@]}
 }
 
+# Archive using multiple threads. Uses 50% of free RAM.
+# All directories by default.
+# Usage: archive_mt [DIRS]
+function archive_mt() {
+	local IFS=$'\n'
+	local targets=(${@})
+	[[ "${targets}" = "" ]] && targets=($(_ls_dir))
+
+	process() {
+		local date=$(_archive_date)
+
+		# Parse name.
+		local name=$(parse_pascal ${target})
+
+		# Determine memory limit.
+		local mem_free=$(_mem_free)
+		local mem_limit=$((mem_free/2))
+
+		# create archive.
+		local hash=$(tar -c ${target} | pv -s $(/usr/bin/du -sb ${target} | awk '{print $1}') | xz -9e --threads=0 --memlimit=${mem_limit}MiB | tee ${name}.txz | sha1sum | cut -d\  -f1)
+
+		# append hash to target name.
+		local new_name="${name}_${date}-${hash}.txz"
+		mv -- ${name}.txz ${new_name} && echo ${new_name}
+	}
+
+	_iterate_targets process ${targets[@]}
+}
+
 # Archive directories with fast compression.
 # All directories by default.
 # Usage: archive_fast [DIRS]
diff --git a/.config/bash/module/Util.sh b/.config/bash/module/Util.sh
index 041c527..ac2a6d9 100644
--- a/.config/bash/module/Util.sh
+++ b/.config/bash/module/Util.sh
@@ -3,6 +3,11 @@ function _core_count() {
 	cat /proc/cpuinfo | grep ^processor | wc -l
 }
 
+# Get the number of available memory (in mebibytes).
+function _mem_free() {
+	free -m | sed -n -e '2p' | awk '{print $7}'
+}
+
 # Parse integers from mixed string.
 function _parse_ints() {
 	echo "${*}" | tr '\n' ' ' | sed -e 's/[^0-9]/ /g' -e 's/^ *//g' -e 's/ *$//g' | tr -s ' ' | sed 's/ /\n/g'