What's difference between an archive and mirror backup system? Which is ElephantDrive?

A mirroring backup system is one that simply mirrors your existing hard drive.  When you delete a file from your hard drive, your online backup does the same. 

An archive system backs up your hard drive, keeps files even after they are deleted, and retains historical versions of your files.  Often, the process to restore and access your data is quite time intensive. 

Fortunately, ElephantDrive offers an archive system with an important distinction from many other online storage alternatives – it’s quick and easy to get your files back.