Time Capsule Oddities

1

I have an Airport Time Capsule that is running as a Time Capsule only. Ever since I can remember, the status of this device has been “1.4 TB of 2 TB available”. However, my oldest backup is only from last November.

As an experiment, I turned off file sharing on the TC. Immediately the disc became unavailable to TM. A day later, no backups had occurred, so I turned file sharing back on. Voila, backups started immediately.

So there’s two things I don’t understand here:

  1. Why isn’t more of the disc used, and
  2. Why does turning off file sharing make the TC unavailable?
3

You must be right. After adding the last big batch of photos, the status dropped to 1.38 TB available.