Duplicati is described as 'Securely store encrypted, incremental, compressed backups on local, cloud, and remote servers. Runs on multiple OSes and offers command line interface' and is a very popular Backup Client in the backup & sync category. There are more than 100 alternatives to Duplicati for a variety of platforms, including Windows, Linux, Mac, Android and BSD apps. The best Duplicati alternative is Rclone, which is both free and Open Source. Other great apps like Duplicati are rsync, Macrium Reflect, TimeShift and Restic.
Duplicati alternatives are mainly File Sync Tools, but if you're looking for
Backup Clients or Online Backup Tools you can filter on that. Other popular filters include
Open Source,
Windows and
Linux. These are just examples - use the filter bar below to find more specific alternatives to Duplicati.
Timeshift is a system-backup tool. Consider it only an alternative if that's what you are using Duplicati for, but if you are backing up documents or photos there are better alternatives.