Duplicati is a backup software that gives users control over where and how their data is stored. It allows users to encrypt their files directly on their computer before sending them to remote storage, ensuring that sensitive information remains secure even if stored with third-party services. Duplicati supports multiple storage options, including popular cloud services like Google Drive, Dropbox, and OneDrive, as well as more technical options like Amazon S3, WebDAV, or SFTP servers. It also works with local or network storage, giving users the flexibility to avoid depending on a single provider. One of Duplicati’s key features is its efficient backup process. During the first backup, all selected data is copied. In subsequent backups, the software only transfers new or modified data by reusing existing blocks. This approach, combined with compression and deduplication, significantly reduces the amount of data that needs to be stored and transferred. Additionally, Duplicati includes an automated backup scheduler, allowing users to set regular backup intervals without manual intervention. The latest version of Duplicati, version 2.4, introduces new features such as the ability to back up entire disks and partitions, as well as a direct file synchronization mode. In its standard backup mode, Duplicati encrypts data locally before sending it to remote storage, using strong encryption methods like AES-256 and GPG. This ensures that even if the data is stored on a third-party service, it remains unreadable without the encryption key. The storage provider does not receive a readable copy of the user's files, maintaining a high level of security. While Duplicati offers a great deal of flexibility, it requires some initial setup. Users must provide login credentials for their chosen storage location and securely store the encryption key used to protect their backups. If the local configuration and database are lost, Duplicati can still reconstruct necessary information from the remote storage, though the encryption key and access to the storage location remain essential. Duplicati is ideal for users who prefer to create a custom backup strategy rather than rely on a single integrated solution. Although it requires more setup than some other tools, it provides significant freedom in choosing storage options and protecting data. The Duplicati software itself is free and open source, though users may choose to pay for additional services or storage space.