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kopia
Cross-platform backup tool for Windows, macOS & Linux with fast, incremental backups, client-side end-to-end encryption, compression and data deduplication. CLI and GUI included.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Note that a simple sync from A to B is not enough to cover every risk, because if something goes bad on the source A, these will be detected as changes and might overwrite the good copies on backup B. Ideally you want something that keeps snapshots of previous versions, so you can roll back to any previous state. I use kopia for this which has both a cli and gui, but there are other options. https://github.com/kopia/kopia
From what I see, duplicati should do the job. It is free GUI-based backup software that allows you to set up incremental backups. https://github.com/duplicati/duplicati