time machine - blank backups

Yosemite can be extremely slow to fill in the history.

Once it was completed sucessfully I set up the time capsule to run on my existing network wirelessly and it appears to be creating backups.

Explain this to me a bit more..

If the TC is plugged into the main router by ethernet and providing wireless for the network which your mac connects to .. that is great.

If the TC is sitting somewhere powered only .. with all connections by wireless.. you will find it difficult to reach and slow..

Describe your whole network.. plus what OS is on the computer?

TM in Yosemite works poorly with a network of any complexity.

I still need you to be more exact.

the time capsule is just bpluged in nand is using wireless.

Plugged into power?

Plugged by ethernet into the main router?

Plugged directly into the Fibre ONT?

Is the TC the only wireless router.. or is there another router.. if so what model number??

IN reality the mac backups are in the region of 4mb I did the first one via ethernet as it contains 100s of pictures which are never changed.

What I am worried about is you are using wireless to a main router which is then relayed to the TC.. and this causes issues.

When I enter the time capsule I can see all the files listed although I haven't tried a restore.

Do you mean Time Machine..?? Time Capsule is the hardware.. Time Machines is the backup software.

The network 90% of the time consists of the macbook pro and a windows 7 64bit PC

You kindly provided the OS of the PC but not the Mac.. I need the Mac one and not the PC.. 😁

I gather the PC is yours.. hence the detail.. and the Mac is the wife's and hence lack of detail??

Just these windows at the back that have white tabs and no writing, the windows in front have a waiting message hence my concerns

Over slow wireless.. you might take an hour or more to fill in.. did you wait long enough??

This will be incredibly slow..

You should plug the TC into the BThub using ethernet.. and set wireless in the TC to create a wireless network.. not extend not join.

Then on the Mac at least connect directly to the TC by 5ghz wireless or even better ethernet.. (if your mac has no port buy thunderbolt to ethernet adapter).

You need to understand what is happening.. the TC has become a wireless client to the BThub.. just as the mac is.. all packets are double hopping over wireless which will cause enormous slowdown and make your backups and opening of TC slow as. You have effectively killed the TC as a wireless router.