diff --git a/README.md b/README.md
index feebd86..1552ea2 100644
--- a/README.md
+++ b/README.md
@@ -126,7 +126,9 @@
 ```
 ./backup.sh backup all
 ```
-**Plese check if `COMPOSE_PROJECT_NAME` exists in your local `gitbucket.conf`!!!**
+
+- **Plese check if `COMPOSE_PROJECT_NAME` exists in your local `gitbucket.conf`!!!**
+- **You have to be install the pbzip2 package!** For debian systems: `apt-get install pbzip2`
 
 #### Full Backup via `backup.sh`
 For backuping the mysql database and the repositories you could use the `backup.sh` script and combine it with a daily cronjob.
diff --git a/backup.sh b/backup.sh
index 481044e..2fc7344 100755
--- a/backup.sh
+++ b/backup.sh
@@ -61,8 +61,9 @@
 	repos|all)
 
 		echo "backup repositories"
-		repoFile="${backupDir}/repositories/${currentDate}.tbz2"
-		tar -cj data/repositories -f ${repoFile}
+		dstFile="${backupDir}/repositories/${currentDate}.tbz2"
+		#tar -cj data/repositories -f ${repoFile}
+		tar -I pbzip2 -c data/repositories -f ${dstFile}
 
 		# copy auto backup folder
 		if [ -d "data/backup" ]; then
@@ -80,8 +81,8 @@
 	
 		if [ -d "data/gist" ]; then
 			echo "backup gist directory"
-			repoFile="${backupDir}/gist/${currentDate}.tbz2"
-			tar -cj data/gist -f ${repoFile}
+			dstFile="${backupDir}/gist/${currentDate}.tbz2"
+			tar -cj data/gist -f ${dstFile}
 		fi
 
 	;;&
@@ -89,8 +90,8 @@
 
 		if [ -d "data/data" ]; then
 			echo "backup data directory"
-			repoFile="${backupDir}/data/${currentDate}.tbz2"
-			tar -cj data/data -f ${repoFile}
+			dstFile="${backupDir}/data/${currentDate}.tbz2"
+			tar -cj data/data -f ${dstFile}
 		fi
 
 	;;&
@@ -104,8 +105,8 @@
 	shift
 	done
 
-	# delete all files older 10 days
-	#find ${backupDir} -iname "*.tbz2" -type f -mtime +10 -exec rm {} \; > /dev/null
+	# delete all files older 30 days
+	find ${backupDir} -iname "*.tbz2" -type f -mtime +30 -exec rm -i {} \; > /dev/null
 }
 
 function restore() {