X shows when running a backup

![screen shot 2014-11-20 at 17 49 52](https://cloud.githubusercontent.com/assets/308507/5129827/b45427dc-70dd-11e4-9204-950356e48fc6.png)

Steps to reproduce:

1. Click run backup
2. Don't reload the page
3. Wait for the backup to complete
4. Notice there is a cross instead of a tick
ah ok, just saw it was used in core, so thought it would be ok in most cases.