diff --git a/backup/backup-all.sh b/backup/backup-all.sh
index 163b3a1..21f1b0e 100755
--- a/backup/backup-all.sh
+++ b/backup/backup-all.sh
@@ -1,7 +1,5 @@
 #!/bin/bash
 
-# by piscue
-
 echo "Starting docker backup"
 echo "  - backup path: $backup_path"
 echo "  - tar options: $tar_opts"
diff --git a/backup/backup-container-data.sh b/backup/backup-container-data.sh
index e19f469..0a49fed 100755
--- a/backup/backup-container-data.sh
+++ b/backup/backup-container-data.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 echo "Backing up container data (inspection output)"
 echo "--------------------------------------------"
 for i in $(docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/)
diff --git a/backup/backup-images.sh b/backup/backup-images.sh
index 4b1b2ef..f90d629 100755
--- a/backup/backup-images.sh
+++ b/backup/backup-images.sh
@@ -1,13 +1,15 @@
+#!/bin/bash
+
 echo "Backing up container images"
 echo "---------------------------"
 
-for i in `docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/`
+for i in $(docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/)
         do container_name=$i
         echo -n "$container_name - "
-        container_image=`docker inspect --format='{{.Config.Image}}' $container_name`
-        mkdir -p $backup_path/$container_name
-        save_file="$backup_path/$container_name/$container_name-image.tar"
-        docker save -o $save_file $container_image
+        container_image=$(docker inspect --format='{{.Config.Image}}' "$container_name")
+        mkdir -p "$backup_path"/"$container_name"
+        save_file="$backup_path"/"$container_name"/"$container_name-image.tar"
+        docker save -o "$save_file" "$container_image"
         echo "OK"
 done
 
diff --git a/backup/backup-volumes.sh b/backup/backup-volumes.sh
index d361e71..d8cef98 100755
--- a/backup/backup-volumes.sh
+++ b/backup/backup-volumes.sh
@@ -1,22 +1,24 @@
+#!/bin/bash
+
 # Path: backup-volumes.sh
 # Backup all volumes from docker
 
 echo "Backing up volumes"
 echo "------------------"
 
-for volume in `docker volume inspect -f '"{{.Name}}""{{.Mountpoint}}"' $(docker volume ls -q)`
+for volume in $(docker volume inspect -f '"{{.Name}}""{{.Mountpoint}}"' $(docker volume ls -q))
 do
 	# Get the volume name and path
-	volume_name=`echo $volume | cut -f2 -d\"`
-	volume_path=`echo $volume | cut -f4 -d\"`
+	volume_name=$(echo "$volume" | cut -f2 -d\")
+	volume_path=$(echo "$volume" | cut -f4 -d\")
 
 	# Create the backup directory
-	mkdir -p $backup_path/volumes
+	mkdir -p "$backup_path"/volumes
 
 
 	# Backup the volume
 	echo -n "$volume_name - "
-	docker run --rm -v $volume_path:/volume -v $backup_path/volumes:/backup busybox tar -cvzf /backup/$volume_name.tar.gz /volume >/dev/null 2>&1
+	docker run --rm -v "$volume_path":/volume -v "$backup_path"/volumes:/backup busybox tar -cvzf /backup/"$volume_name".tar.gz /volume >/dev/null 2>&1
 	echo "OK"
 done
 
diff --git a/backup/sync-dropbox.sh b/backup/sync-dropbox.sh
index 66fab31..b25416e 100644
--- a/backup/sync-dropbox.sh
+++ b/backup/sync-dropbox.sh
@@ -1,40 +1,42 @@
-for i in `docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/`
+#!/bin/bash
+
+for i in $(docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/)
         do container_name=$i
 
         # Creating container folder
-        docker run --rm --user=$(id -u):$(id -g) \
-        -v $PWD/config:/config \
-        -v $backup_path:/workdir \
+        docker run --rm --user="$(id -u)":"$(id -g)" \
+        -v "$PWD"/config:/config \
+        -v "$backup_path":/workdir \
         peez/dropbox-uploader \
-        mkdir $container_name
+        mkdir "$container_name"
 
         # Uploading image
         echo "$container_name - image to Dropbox "
         # TODO check if the file exists
-        docker run --rm --user=$(id -u):$(id -g) \
-        --name dropbox-$container_name-image-backup \
-        -v $PWD/config:/config \
-        -v $backup_path:/workdir \
+        docker run --rm --user="$(id -u)":"$(id -g)" \
+        --name "dropbox-$container_name-image-backup" \
+        -v "$PWD"/config:/config \
+        -v "$backup_path":/workdir \
         peez/dropbox-uploader \
-        upload $container_name/$container_name-image.tar \
-        $container_name/$container_name-image.tar && \
+        upload "$container_name"/"$container_name-image.tar" \
+        "$container_name"/"$container_name-image.tar" && \
 
         # remove local image, TODO creating a condition to know if the file
         # uploaded well before deleting
-        rm -f $backup_path/$container_name/$container_name-image.tar
+        rm -f "$backup_path"/"$container_name"/"$container_name-image.tar"
 
         # Uploading volume
         echo "$container_name - volume to Dropbox "
         # TODO check if the file exists
-        docker run --rm --user=$(id -u):$(id -g) \
-        --name dropbox-$container_name-volume-backup \
-        -v $PWD/config:/config \
-        -v $backup_path:/workdir \
+        docker run --rm --user="$(id -u)":"$(id -g)" \
+        --name "dropbox-$container_name-volume-backup" \
+        -v "$PWD"/config:/config \
+        -v "$backup_path":/workdir \
         peez/dropbox-uploader \
-        upload $container_name/$container_name-volume.tar.xz \
-        $container_name/$container_name-volume.tar.xz && \
+        upload "$container_name"/"$container_name-volume.tar.xz" \
+        "$container_name"/"$container_name-volume.tar.xz" && \
 
         # remove local volume, TODO creating a condition to know if the file
         # uploaded well before deleting
-        rm -f $backup_path/$container_name/$container_name-volume.tar.xz
-done
+        rm -f "$backup_path"/"$container_name"/"$container_name-volume.tar.xz"
+done
\ No newline at end of file