I'm not sure this is the case. From what I gather the .ELM files are certainly not raw files.
Yes, you can use SFTP to get the raw files but the SFTP is not a traditional SFTP server where you access files laying in a filesystem. Instead the edsftp server queries the ELM backend components to create a dynamic file list.
Sadly, the edsftp process is complete very unstable and tends to crash in the middle of large file transfers. So as long you want one of two hours of logs you are fine, but if you try to get 2 days worth of logs... good luck.