Virtual Backup 64 -

The "64" in the title almost certainly refers to 64-bit architecture support. In the context of system utilities, this usually indicates a tool that was updated from an older 16-bit or 32-bit version to run on Windows 7, 8, or 10. It suggests a focus on file-level backup rather than full image-based virtualization.

.z64 represents a native, big-endian dump (true to the original hardware layout). virtual backup 64