What are some alternatives?
When comparing ChronoSync and SpiderOak, you can also consider the following products
Time Machine - Time Machine is the breakthrough automatic backup that’s built right into Mac OS X.
Dropbox - Online Sync and File Sharing
Carbon Copy Cloner - Carbon Copy Cloner (CCC) features an interface designed to make the cloning and backup procedure...
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Mega - Secure File Storage and collaboration