Consider a disk with a single NTFS C: partition and Windows installed on it.

If I were to make a [7z](http://www.7-zip.org/) archive of the partition, and grab the [MBR](http://en.wikipedia.org/wiki/Master_boot_record) via some tool (then store it in a file), would this be a complete backup of the disk?

By "complete backup", I'm asking if doing a backup in this manner, then restoring it later, would something break in a way that would render this way of making backups unusable as an alternative to something like Acronis or Symantec software.