Upgrading phone, what happens to previous icloud phone backup?

[iosxuser]

So lets say i currently have a iphone 5... which is using 93mb of icloud back up.

what happens when i get iphone 6? i know i can sync it to the new phone... but what happens to the rest of the data... does it stay forever in icloud unused or you can delete it somehow?

thx

 

[iDuel]

You can actually restore the iPhone 6 from the same backup you used for your five. If you do choose to set the 6 up as a new phone, then it will be a separate back up in which case the iPhone 5 backup will remain on iCloud servers unless you choose to delete it.