Robocopy — memo sheet

Copies subfolders including empty ones without deleting destination extras.

Shows what would happen without copying.

TEE writes to console and log.

/Z supports restartability but can affect performance.

Includes empty subdirectories without purging extras.

Alternative when empty directories are not needed.

Example: /XD "System Volume Information" Temp.

Avoids some loops/unwanted junction traversal.

Accepts names and patterns such as *.tmp.

Useful to exclude very large files in an initial pass.

Check date/age syntax before production.

Useful for archive scopes.

Typical content copy without NTFS security.

Requires sufficient privileges for S/O/U.

Use only when full security preservation is required.

Useful when directory timestamps/attributes must be preserved.

Allows restart of interrupted large-file copies.

Backup mode requires privileges and can bypass some ACL restrictions.

Set a reasonable value; historical defaults can be very high.

Limits time wasted on persistently locked files.

Example /MT:16; increases CPU, disk and network load.

Can help with very large files depending on storage.

Legacy throttling approach; validate actual impact.

Small-file count can matter more than total bytes.

Can delete destination content not present in source.

Always dry-run with /L on sensitive scopes.

Deletes source after copying; destructive action.

Source directories remain.

Prefer a reliable local log path during critical migrations.

Useful for live monitoring and evidence.

These codes represent copy/extra/mismatch combinations, not necessarily failure.

Treat as failure and inspect the log.