Duplicacy is a new generation cloud-backup tool supporting most cloud-storage providers (Amazon S3, Google Cloud Storage, Microsoft Azure, Dropbox, Backblaze, and Google Drive), as well as local disks and SFTP servers (such as Mac/Linux computers or NAS boxes). Duplicacy is the only cloud-backup tool that offers all the following 7 essential features:
Duplicacy also comes with an elegantly designed GUI that features one-page configuration to allow you to quickly set backup schedules and retention policies. You can also easily configure advanced options such as email notifications, automatic start on logon, and exclude/include patterns. Duplicacy is $1 per month per computer for personal use; for commercial use, the subscription cost is extremely low -- only $3 per month for each computer.