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If you've found this file on your server or within a project folder, you’re likely asking two questions: What is it? and Can I delete it? 1. Decoding the Filename The structure of 1621058650.vac gives us two major clues:

Used by specific industrial or proprietary backup tools. 2. How to Investigate the File

file 1621058650.vac This command will tell you if it’s an ASCII text file, a binary, or a compressed archive.