Duplicacy is described as 'new generation local and cloud backup tool that supports cross-computer deduplication. It is free for personal use and source code is available to commercial users' and is an app in the Backup & Sync category. There are more than 50 alternatives to Duplicacy for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Android. The best alternative is Duplicati, which is both free and Open Source. Other great apps like Duplicacy are Restic (Free, Open Source), TimeShift (Free, Open Source), Déjà Dup (Free, Open Source) and Acronis Cyber Protect Home Office (Paid).
Duplicati is a 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.
TimeShift for Linux is an application that provides functionality similar to the System Restore feature in Windows and Time Machine tool in Mac OS. TimeShift protects your system by taking incremental snapshots of file system at regular intervals.
Acronis Cyber Protect Home Office is a software product produced by Acronis that provides data protection including, backup, archive, access and recovery for Microsoft, macOS, iOS and Android operating systems.
Time Machine is the breakthrough automatic backup that’s built right into Mac OS X. It keeps an up-to-date copy of everything on your Mac — digital photos, music, movies, TV shows, and documents. Now, if you ever have the need, you can easily go back in time to recover anything.