What happens to the original session when using 'Save As'?

When using 'Save As' in Pro Tools, the original session remains intact while a new copy is created. This function allows users to create a duplicate of the existing session with a new name or in a different location without affecting the original. This practice is especially useful for preserving workflow, enabling an artist or engineer to explore different versions of their work without the risk of losing or altering the original session. Consequently, the new session can be modified independently, allowing users to test different ideas or make significant changes while having the security of the unchanged original session to fall back on if needed. This process is fundamental for maintaining organization and safeguarding creative work in a digital audio workstation.