What is the difference between Regional EFS and One Zone EFS?
Regional EFS (Recommended by AWS): Data is automatically written redundantly across at least three geographically separated Availability Zones. If an entire data center or AZ goes down, your applications can continue accessing their files seamlessly from another AZ. One Zone EFS: Data is kept inside just one specific Availability Zone. While it still protects against individual disk or server failures within that zone, a catastrophic physical failure affecting the entire AZ could result in data loss. To mitigate this, One Zone file systems have automated backups enabled by default via AWS Backup
