Duply is described as 'duply is a frontend for the mighty duplicity magic. duplicity is a python based shell application that makes encrypted incremental backups to remote storages. Different backends like ftp, sftp, imap, s3 and others are supported' and is an app in the Backup & Sync category. There are seven alternatives to Duply for a variety of platforms, including Mac, Linux, Windows, BSD and Google Drive. The best alternative is Duplicati, which is both free and Open Source. Other great apps like Duply are rsync (Free, Open Source), Duplicity (Free, Open Source), RsyncOSX (Free, Open Source) and GS RichCopy 360 (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.
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.
Backer is a visual front end to the rsync command. It allows the user to select multiple folders and back them up to multiple locations. It stores your backup settings for you so that all your backups can be run easily using a single button click.