Talking about keeping people happy with their technology… Let’s keep your data safe, shall we? :D
If you’re running Time Machine on your Mac you can pull down the little Time Machine menu in the top right of your screen to see when the last backup was (see image below). If you had a successful backup recently, it will show “Latest Backup: [some recent date]“.
Anyone not running Time Machine is probably not backing up, which means a hard drive failure can be disastrous. That would be no fun at ALL.
If there’s an error like “Delayed”, then you can actively tell it to backup from this same menu. Connect the drive, or join the Time Capsule wireless network, and choose “Back Up Now”.