GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.