Facts regarding customization and revision, namely, the use of Dropbox, a free cloud service (www.dropbox.com): two copies of Client Practice Manager come with its purchase, one for your practice's use and one to be put in your Dropbox folder. The Dropbox copy will never contain client data. With your permission, as owner, it will be accessible for customizations and updates. Should that copy ever be revised or updated, it can replace your practice copy by importing its data by means of a built-in script. A fresh, empty copy will then be made available for your Dropbox folder.