Use Disk Utility to format a 16GB+ drive as Mac OS Extended (Journaled) .
Compare it to known good hashes for 10.13.6: macos high sierra 10136 dmg google drive best
If after searching you still cannot locate a verified macOS High Sierra 10.13.6 DMG on Google Drive, here are two safe backups: Use Disk Utility to format a 16GB+ drive
macOS High Sierra 10.13.6 full installer - Apple Communities macos high sierra 10136 dmg google drive best
– Official macOS installers are signed by Apple. Unofficial DMGs may have broken or missing signatures.