An EBS volume is a block storage device that is most similar to a virtual hard disk in the
cloud as when attached to an instance it appears as a local disk that can have an operating
system installed on or be formatted and used for any other local storage purpose
An EFS filesystem is mounted over the NFS protocol which is a file-level protocol.
Therefore, it is a network filesystem not a virtual hard disk and cannot have an operating
system installed or be formatted and used as a locally attached disk
S3 is an object storage system and cannot be mounted and used as a virtual hard drive
Glacier is an archiving solution where you can archive your S3 objects at extremely low cost