Hello, if you are able to mount the EFS on the instance with that EBS attached, you can copy the information using tools like rsync, which will allow to sync all the data from source to destination, here you have an example of how to use it
rsync -apv /data/mydisk/ /mount/myefs/
This command will sync all the info from the specific path to your mount point.
I hope this works for you
DataSync does not support EBS as a direct location to transfer data from. If you can create an NFS or SMB share for that EBS data then you can use DataSync to move data from the source file share to an EFS location.
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