Upload speeds differ depending on local and time of day but for a typical system on a typical broadband line - Backup
For Dummies backs up data at the rate of about 2-4 GB per day. If left undisturbed on a fast connection, however, you can back up over 9 GB in a single day.
During installation, Backup For Dummies runs a bandwidth test and lets you know about how much you can upload a day.
After your initial backup, subsequent backups are relatively quick. Chances are that you won't even notice them. This is because Backup For Dummies only backs up the portions of your files that have changed since the last time they were backed up. This saves lots of time, bandwidth and storage space.