diff --git a/backup.sh b/backup.sh
old mode 100644
new mode 100755
index 96b1659..ff1351c
--- a/backup.sh
+++ b/backup.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 BACKUP_DATE=$(date +"%Y-%m-%d")
 BACKUP_BASENAME=$S3_BUCKET_NAME$BACKUP_DATE.tar
@@ -39,11 +39,11 @@ healthchck_start "Starting Backup"
 cd /backup
 echo "make archive"
 FROMPATH='./'
-FROMSIZE=`du -sk ${FROMPATH} | cut -f 1`;
-CHECKPOINT=`echo ${FROMSIZE}/50 | bc`;
+FROMSIZE=$(du -sk ${FROMPATH} | cut -f 1);
+CHECKPOINT=$(echo ${FROMSIZE}/50 | bc);
 echo "Estimated: [==================================================]";
 echo -n "Progess:   [";
-(tar -c --record-size=1K --checkpoint="${CHECKPOINT}" --checkpoint-action="ttyout=>" -f - "${FROMPATH}" | bzip2 > "${$BACKUP_FILENAME}") || healthchck_fail  "TAR Failed"
+(tar -c --record-size=1K --checkpoint="${CHECKPOINT}" --checkpoint-action="ttyout=>" -f - "${FROMPATH}" | bzip2 > "${BACKUP_FILENAME}") || healthchck_fail  "TAR Failed"
 echo "]"
 cd /
 echo " done"