Jungle Disk costs $2 or $3 per month for using its software, paired with passing along cloud storage prices. Jungle Disk's parent company, Rackspace, charges 15 cents per gigabyte of storage per month, as does Amazon S3. Amazon adds additional fees for data transfers in and out, as well as requests. (See for complete details.)

SpiderOak charges a flat rate of $10 per month, or $100 per year, per 100GB of storage.

Most of the software eschew standard Mac OS X selection and interface elements. Instead, they tend to stick options all over the place, often with inconsistent usage, and provide some truly baffling selection and restore interfaces. Menus are particularly misused.

Mozy scatters parts of its functions across several independent floating windows and programs, including the critical tasks of file selection and restore, and adds in a system preference pane to boot. SpiderOak's colorful front end looks nothing like a Mac app.