diff --git a/backup.sh b/backup.sh
index f24f578..53f57d7 100644
--- a/backup.sh
+++ b/backup.sh
@@ -4,10 +4,13 @@ set -e
 
 echo "Job started: $(date)"
 
+echo "deleting files older than 30 days"
+find /backup -mtime +30 -type f -delete
+
 DATE=$(date +%Y%m%d_%H%M%S)
-FILE="/backup/backup-$DATE.tar.gz"
+FILE="/backup/$MONGO_DB_NAME-backup-$DATE.tar.gz"
 
-mongodump --quiet -h $MONGO_PORT_27017_TCP_ADDR -p $MONGO_PORT_27017_TCP_PORT
+mongodump --quiet -h $MONGO_PORT_27017_TCP_ADDR -p $MONGO_PORT_27017_TCP_PORT --db=$MONGO_DB_NAME
 tar -zcvf $FILE dump/
 rm -rf dump/
 
diff --git a/start.sh b/start.sh
index 34cf936..b11a7ce 100644
--- a/start.sh
+++ b/start.sh
@@ -13,6 +13,7 @@ else
     fi
     CRON_ENV="MONGO_PORT_27017_TCP_ADDR='$MONGO_PORT_27017_TCP_ADDR'"
     CRON_ENV="$CRON_ENV\nMONGO_PORT_27017_TCP_PORT='$MONGO_PORT_27017_TCP_PORT'"
+    CRON_ENV="$CRON_ENV\nMONGO_DB_NAME='$MONGO_DB_NAME'"
     echo -e "$CRON_ENV\n$CRON_SCHEDULE /backup.sh > $LOGFIFO 2>&1" | crontab -
     crontab -l
     cron