Rule one of professional repair — data first, repair second. Robocopy, already inside every Windows, copies a full user profile reliably where drag-and-drop fails.
Ask a technician what separates them from an amateur and the answer is not speed — it is that they back up before they touch anything. Windows may be reinstalled in an hour; a family's photos cannot. Explorer copy-paste is a poor backup tool: it stops at the first locked or long-path file and tells you nothing afterwards. Robocopy is the professional answer — resumable, logged, and already built into Windows. This guide gives you one clean script you can save in your portable toolkit and reuse on every job.
Open Command Prompt and adapt this line — source is the user's profile folder, destination is a folder on your external drive:
robocopy "C:\Users\Username" "E:\Backup\Username" /E /COPY:DAT /R:1 /W:1 /XJ /LOG:E:\Backup\log.txt/E copies all subfolders including empty ones, so the folder structure survives/COPY:DAT keeps file data, attributes and timestamps — the defaults that matter/R:1 /W:1 retries a locked file once after one second instead of robocopy's factory default of a million retries, which can stall a job for hours/XJ skips junction points, avoiding the endless loops that profile folders are famous forRobocopy has a mirror switch, /MIR, and it is the most dangerous word in this guide. Mirroring makes the destination identical to the source — including deleting destination files that no longer exist in the source. Point a mirror at the wrong folder pair and your backup deletes itself. For pre-repair backup, plain /E copies without deleting anything, ever. Mirror mode has legitimate uses in scheduled backup systems; a technician's rescue copy is not one of them.
When robocopy finishes, the summary is your report:
Save the command as a batch file inside your portable toolkit folder:
backup-profile.batWith the data safe, every repair after this point becomes calm — including the ones in the full video, where the toolkit workflow continues from exactly this step.
The complete walkthrough — GUI interface, portable software and the command library, shown live on a real PC.
▶️ Watch Full VideoBecause Explorer gives up silently. One locked file stops or corrupts the whole queue, long paths fail without clear messages, and there is no record of what actually copied. Robocopy retries sensibly, skips junctions that cause loops, completes the job and writes a log you can check line by line.
It tries, with the retry limits you set, but a file locked by a running program may still fail — that is what the FAILED column and the log are for. For a profile backup, closing the user's programs first, or copying after booting into another environment, clears almost every lock.
At least as big as the data inside the profile — check the profile folder's size in its Properties first. Photos and videos dominate most profiles. A 128 GB or larger external drive covers most home users, and the log tells you exactly how much was copied.