Carbonite Safe is an online backup service that offers unlimited storage and uses Windows' own File Explorer for data selection. It's simple and effective, though integration into Windows 11 Explorer isn't as elegant as it is in Windows 10.
The security- and privacy-focused SpiderOak One Backup is now in maintenance mode, so it's no longer getting new features. It also costs more than many competitors, but it doesn't limit the number of PCs you can back up with a single account.
Online backup service OpenDrive is a good value and features an intuitive web interface, but it could use better encryption options and the desktop app feels a little disjointed.
iDrive offers online storage, sharing, backup, and more. Unless you want the functionality of an office suite, online services don't get any more comprehensive.