I would love to see a backup/restore functionality where I can choose where I want to store my backups. I am an iOS developer and was going to develop a time keeping app like this, but why reinvent the wheel when you have something as good as this. However, in my apps I use Dropbox to allow my users to backup and restore their data. What I would really like to do is develop a Mac app that can load in the backup, allow me to edit and update the backup and then allow the app to restore from my edits.
Having said that, the ability to edit via the web app would be nice, but that means an additional subscription cost that I am not quite willing to do.