Wondering what the best option is for cloud storage.

I'm not looking into backing up my entire PC. Just specific folders scattered around my PC that I can select from. A client that easily lets me back them up whenever I want it to is ideal as well.

I looked into Backblaze, but their "Computer Backup" service backs up your entire PC, which is more than I need. They also have "B2 Cloud Storage" but I don't think it has a client.

Looking for any advice. Thanks