It's a standard backup file that someone named after themselves or a project, which was then uploaded and forgotten.
There have been instances where ransomware or malicious actors use 7-zip to archive and password-protect a user's data, naming the archive something seemingly random like "Bernas". 3. Connection to Music or Media Bernas.7z
In technical support communities, "Bernas.7z" is frequently cited as an example of a found on a computer after a malware infection or a visit to a questionable site. It's a standard backup file that someone named