diff --git a/README.md b/README.md
index 4e6beb7..328a5e6 100644
--- a/README.md
+++ b/README.md
@@ -51,12 +51,12 @@ To restore a backup, uncompress it and use the official `mongorestore`
 
 ### Environment Variables
 
-| Variable                | Description                | Default       | Example       |
-|-------------------------|----------------------------|---------------|---------------|
-| `MONGO_INITDB_DATABASE` | Database name to backup    | -             | `myapp`       |
-| `BACKUP_CRON`           | Cron schedule expression   | -             | `0 */6 * * *` |
-| `BACKUP_DIR`            | Directory to store backups | /data/backups | `/backups`    |
-| `BACKUP_RETENTION`      | Number of backups to keep  | -             | `7`           |
+| Variable           | Description                    | Default                  | Example       |
+|--------------------|--------------------------------|--------------------------|---------------|
+| `BACKUP_CRON`      | Cron schedule expression       | -                        | `0 */6 * * *` |
+| `BACKUP_DIR`       | Directory to store backups     | /data/backups            | `/backups`    |
+| `BACKUP_DB`        | Database that will be backedup | `$MONGO_INITDB_DATABASE` | `admin`       |               |
+| `BACKUP_RETENTION` | Number of backups to keep      | -                        | `7`           |
 
 ### Built With
 
diff --git a/backup.sh b/backup.sh
index 6caa28b..f174371 100644
--- a/backup.sh
+++ b/backup.sh
@@ -6,7 +6,8 @@ TEMP_DUMP="/tmp/mongo_dump_${TIMESTAMP}"
 
 # Create & zip backup
 mkdir -p "$BACKUP_DIR"
-mongodump --host localhost --db "$MONGO_INITDB_DATABASE" -u "$MONGO_INITDB_ROOT_USERNAME" -p "$MONGO_INITDB_ROOT_USERNAME" --out "$TEMP_DUMP"
+if [[ -z "$BACKUP_DB" ]]; then BACKUP_DB="$MONGO_INITDB_DATABASE"; fi
+mongodump --host localhost --db "$BACKUP_DB" -u "$MONGO_INITDB_ROOT_USERNAME" -p "$MONGO_INITDB_ROOT_USERNAME" --out "$TEMP_DUMP"
 tar -czf "${BACKUP_DIR}/${BACKUP_FILE}" -C "$TEMP_DUMP" .
 rm -rf "$TEMP_DUMP"