Acronis True Image 2020 and 2021: tib and tibx backup format usage

This paper focuses on software-agnostic conversion principles applicable to:

The .TIB UPD extension is actually a associated with the legacy .TIB format (used up to Acronis True Image 2020). When you perform an incremental backup to a .TIB file, Acronis creates a separate .TIB UPD file for each increment. For example: