Carbon Copy Cloner

Carbon Copy Cloner is a security backup copy tool that allows you to clone your entire hard drive, or just select certain files that you want to back up.

The backup copy is stored as a disk image that you can encrypt if you don't want anyone else to have access to it.

The disk image can be dynamic (read and write) or static (read-only). In the case of the latter, you'll need double the disk space if you're working with individual files.

It is, of course, possible to compress the disk image and segment it, providing maximum megabyte values.

You can also save a backup copy and give it an expiration date.