MSP360 (formerly CloudBerry Backup, before the 2020 rebrand) has been the power-user choice for cloud backup on Windows for over a decade. It supports every cloud you can think of, has granular control over everything, and is widely used by IT consultants and managed service providers.
It's also famously dated. The UI hasn't really changed since the CloudBerry days, the configuration flow has dozens of options on every screen, and the documentation reads like enterprise software because that's effectively what it is.
BackupKit covers the same territory — any cloud, encrypted, scheduled — but is built for users who'd rather not feel like they're configuring SAP for the rest of their afternoon.