The best Online Backup alternative to FreeFileSync is Syncthing, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to FreeFileSync and four of them are Online Backup Tools so hopefully you can find a suitable replacement. Other interesting Online Backup Tool alternatives to FreeFileSync are Restic, Plakar and Rustic.
Open-source, peer-to-peer service offering encrypted file synchronization, ensuring data privacy and user-autonomy without relying on cloud storage or central servers, suitable for various uses.
FreeFileSync is intended for backing up some directories to a remote drive. Syncthing is intended for keeping two directories in sync in real time.
It serves different purpose
restic is a program that does backups right. The design goals are: Easy, Fast, Verifiable, Secure, Efficient, Free.
An open-source backup and restore platform built for modern workloads. It offers encrypted, deduplicated, and instantly recoverable snapshots across file systems, object stores and cloud environments.
Rustic is a backup tool that provides fast, encrypted, deduplicated backups written in Rust. It reads and writes the restic repo format described in the design document and can be used as a restic replacement in most cases.
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FreeFileSync is used to sync files between directories/drives, while Syncthing is used to sync files between devices.