How many versions of a file does Carbonite keep?
Starting with version 3.5, Carbonite will keep up to 3 months worth of old versions of the files in your backup. For example, if you edit a document daily over the course of three months, Carbonite will save one version for each of the previous 7 days, one version for each of the prior 3 weeks, and one version for each of the prior 2 months.