What are some alternatives?
When comparing GoodSync and FreeFileSync, you can also consider the following products
rsync - rsync is a software application for Unix which synchronizes files and directories from one location...
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Dropbox - Online Sync and File Sharing
SyncBack - Backup software for the PC: powerful, easy to use solution for backing up and synchronising files on a local/network drive, the cloud, FTP server and more.
SolarWinds Backup - Modern server backup software
Macrium Reflect - Macrium Software - the creators of Macrium Reflect backup, imaging and cloning software.