Duplicati is described as 'backup client that securely stores encrypted, incremental, compressed backups on local storage, cloud storage services and remote file servers. The Duplicati project was inspired by Duplicity and had similar functionality until 2008' and is a well-known app in the Backup & Sync category. There are more than 100 alternatives to Duplicati for a variety of platforms, including Windows, Mac, Linux, Android and iPhone. The best alternative is rsync, which is both free and Open Source. Other great apps like Duplicati are Rclone (Free, Open Source), Spideroak One Backup (Paid), GoodSync (Freemium) and BackBlaze (Paid).
myDataSync is an integration of two of world's most secured and trusted cloud computing platforms i.e., Amazon and Asigra. myDataSync offers unified solution for all your cloud backup and disaster recovery requirements.
EvaCopy which stands for EVACuate and Copy is one such unique backup solution, that combines versioning in combination with backup for easy restoration. The program is simple to configure and distribute across multiple workstations.
S4 is an Amazon S3-based application of Least-Authority File System, or LAFS. LAFS is a free, open source cloud storage system with verifiable end-to-end security. It distributes your data across multiple servers.
Rebel Backup lets you make encrypted backups of your important files offsite to Dropbox or Google Drive. You control what and how often is backed up, and the encryption happens locally on your computer.
Backazon is an online backup utility for Windows client (XP/Vista) and Windows server (2003/2008) systems. Backazon lets you select files and directories and then establish a schedule for automatic backups.