Setting up 2TB Time Capsule for backups only.

I have used my 2TB Time Capsule for years but since relocating, I have not had it connected for some time. The reason being that mu Sky Router is downstairs, in the hallway and my Hive Heating modem plugged into it. My iMac and Time Capsule are upstairs in my study. Is there any way to use the TC for automatic backups, without being connected to the Sky router, and are there any issues with the old backups that should be sitting on the TC?