Standard sync, optimized for speed by bypassing any unneeded steps.
Sync even if the upstream metadata appears to have no change. This option is only relevant for yum repositories and will take longer than an optimized sync. Choose this option if:
One or more RPMs are not showing up in the local repository even though they exist in the upstream repository.
Performs a complete sync, verifying the checksum of all packages afterwards. Any missing or corrupt RPMs will be re-downloaded. This option will take the longest amount of time and is only relevant for yum repositories.. Choose this option if:
Specific RPMs are throwing a 404 from yum or dnf.
RPMs are corrupt, often leading to an error "Package does not match intended download".
When validating content, repositories using the "On Demand" download policy will download all packages within the repository.