The RAR format acts like a digital vacuum-seal. By "packing" the files, the creator ensured that if one photo was corrupted, the integrity of the entire archive might still be protected by recovery records. The Story of the "Last Backup"
This was likely a naming convention used by a family member to aggregate every single piece of media related to their mother—scanned polaroids from the 70s, shaky camcorder footage from the 90s, and high-definition phone videos from the 2010s. It represents a "Volume 2" of a life’s work in curation.
It is a silent, digital act of love—taking the chaotic, fragmented "data" of a parent's life and compressing it into a single, portable, and permanent "1All" package. When you see a file like that, you aren't just looking at code; you're looking at someone’s attempt to make sure a person’s history never disappears.
The "1All mom2" file is often the result of a "Sunday Project." A son or daughter spends an entire weekend hunched over a laptop, converting old proprietary video formats into something modern. They label it pragmatically so they don't lose it in a sea of other backups.