Robocopy Command Builder
Build a safe Robocopy command for migrations, mirrors and backups – multithreaded, with retries, logging and an optional dry run.
Robocopy is the most reliable way to move file shares on Windows – it resumes, retries and can keep NTFS permissions. Its defaults are risky, though: a million retries per locked file, and /MIR deletes files without asking. Build a command with sensible switches, a log file and a dry run first.
Migrating a file server
- Run the dry run (
/L) and read the summary. - Run the real copy with permissions (
/COPY:DATSOU) days before the cut-over. - On the night, run it again – only changed files copy, so it’s quick.
- Switch users to the new share and keep the old one read-only for a week.
Häufige Fragen
Why does /MIR delete files?
Mirror makes the destination an exact copy of the source, so anything that exists only in the destination is removed. Always run it with /L first.
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