How to save backup file in .zip format instead of .tzst extension in Plesk
Now in Plesk backup files are saved with .tzst extension. Because .tzst extension is the new default compression method for backups
Previously, these were saved as .zip files. However, you can easily change back it to zip.
For this, install Panel.ini Editor extension in Plesk. After installing open this extension in editor tab and paste this text at the end of file.
[pmm]
compressionMethod = deflate