Very slow on line backup

Hi

Very new to this forum but currently running/using Norton 360.....................Great product.

However when completing my latest 'comprehensive scan' the backup took over 12 hours to complete. It's never taken that long before.

Is this a known issue/problem or something I now have to 'put up with'?

Since my previous (normal speed) backup I had added a few songs in i-tunes, would that make a major difference?

 

Thank you

 

Pete