diff --git a/docker_volume_backup.sh b/docker_volume_backup.sh
index 91940f2..755cca6 100755
--- a/docker_volume_backup.sh
+++ b/docker_volume_backup.sh
@@ -1,53 +1,64 @@
 #!/bin/bash
 
-compose_file_path=$1
+compose_file_path=${1}
 project_name=${2,,}
-backup_path=$3
-backup_or_restore=$4
-restore_date=$5
+backup_path=${3}
+backup_or_restore=${4}
+restore_date=${5}
 
 set -e
 
 function backup_volume {
-  volume_name=$1
-  backup_destination=$2
-  date_suffix=$(date -I)
+  volume_name=${1}
+  backup_destination=${2}
+  date=$(date -I)
 
-  docker run --rm -v $volume_name:/data -v $backup_destination:/backup ubuntu tar -zcvf /backup/$volume_name-$date_suffix.tar /data
+  docker run --rm \
+             -v ${volume_name}:/data \
+             -v ${backup_destination}:/backup \
+             ubuntu \
+             tar -Jcvf /backup/${volume_name}-${date}.tar.xz /data
 }
 
 function restore_volume {
-  volume_name=$1
-  backup_destination=$2
-  date=$3
+  volume_name=${1}
+  backup_destination=${2}
+  date=${3}
 
-  docker run --rm -v $volume_name:/data ubuntu find /data -mindepth 1 -delete
-  docker run --rm -v $volume_name:/data -v $backup_destination:/backup ubuntu tar -xvf /backup/$volume_name-$date.tar -C .
+  docker run --rm \
+             -v ${volume_name}:/data \
+             ubuntu \
+             find /data -mindepth 1 -delete
+  docker run --rm \
+             -v ${volume_name}:/data \
+             -v ${backup_destination}:/backup \
+             ubuntu \
+             tar -xvf /backup/${volume_name}-${date}.tar.xz -C .
 }
 
 function main {
   echo "Stopping running containers"
-  docker-compose -f $compose_file_path -p $project_name stop
+  docker-compose -f ${compose_file_path} -p ${project_name} stop
 
   echo "Mounting volumes and performing backup/restore..."
-  volumes=($(docker volume ls -f name=$project_name | awk '{if (NR > 1) print $2}'))
+  volumes=($(docker volume ls -f name=${project_name} | awk '{if (NR > 1) print ${2}}'))
   for v in "${volumes[@]}"
   do
-    if [ "$backup_or_restore" == "backup" ]
+    if [ "${backup_or_restore}" == "backup" ]
     then
       echo "Perform backup"
-      backup_volume $v $backup_path
+      backup_volume ${v} ${backup_path}
     fi
 
-    if [ "$backup_or_restore" == "restore" ]
+    if [ "${backup_or_restore}" == "restore" ]
     then
       echo "Restore from backup"
-      restore_volume $v $backup_path $restore_date
+      restore_volume ${v} ${backup_path} ${restore_date}
     fi
   done
 
   echo "Restarting containers"
-  docker-compose -f $compose_file_path -p $project_name start
+  docker-compose -f ${compose_file_path} -p ${project_name} start
 }
 
 main