I am doing work on a client's site (who had another developer customize the Twenty Twelve theme without using a child theme. So, when updating WordPress core, Twenty Twelve was overwritten. I had done a backup this morning with Simple Backup, so I was just going to unzip the backup and install the theme from the backup. The problem is, that the active theme was not included in the backup, so my client's customizations are gone.
Any ideas? Thanks!