Apple’s Time Capsule combined a Wi-Fi base station and a hard drive for networked data access and Time Machine backups. The company discontinued the device and other related network gear, but there are plenty still in operation.
A problem with Time Capsule is that its drive can get filled with outdated backups if you migrate computers and don’t adopt the old backup set. Fortunately, Time Capsule exposes that data in a particular way, making it possible to delete unwanted backups.
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The Data folder in the Time Capsule volume holds Time Machine backups. (Yes, the screen capture is ancient, from the last time I used Time Capsule for backups.)
