EZ Exporter now supports an option in the Export Profile settings to automatically append data to an existing file on the SFTP (SSH) server.

A couple notes:

1. This option will only work with text files (i.e. file format in EZ Exporter is set to "Delimited Text (CSV, TSV, TXT)" without compression).
2. If the file doesn't exist on the server, a new file will be created.

Here's what this setting looks like in the app: