在不锁定mongodb数据的情况下备份mongodb数据的好策略是什么（fsync和lock）？

We have a mongodb running on only one AWS EC2 (no master-slave, no replica sets). The data files are stored in a separate EBS volume. So, what is the best way to backup and restore the data without locking it from writing (sync & lock)? Or we must have master-slave to achieve it?We have a mongodb running on only one AWS EC2 (