---
id: external-drives.is-my-external-drive-the-only-copy-of-moved-files
url: https://storagestudio.us/faq/external-drives/is-my-external-drive-the-only-copy-of-moved-files
category: "External drives"
subcategory: "Choosing a drive"
question: "Once I move files to the external drive, is that the only copy?"
alt_questions:
  - "Does moving to the fast drive keep a copy on my Mac?"
  - "Are moved files backed up anywhere?"
  - "If my external SSD dies do I lose moved files?"
  - "Is relocating the same as backing up?"
  - "Should I back up my fast drive?"
  - "storage studio move vs copy external drive"
short_answer: "Yes. A move frees space because the original leaves your Mac, so the external drive then holds the only copy. Back it up — Backup Drive copies it to a second drive, and Data Backup keeps versioned copies."
tags: ["backup", "only copy", "moving"]
related: ["https://storagestudio.us/faq/external-drives/can-i-use-my-time-machine-drive-as-the-fast-drive", "https://storagestudio.us/faq/external-drives/what-kind-of-external-drive-should-i-use-with-storage-studio", "https://storagestudio.us/faq/external-drives/can-i-use-a-spinning-hard-drive-as-my-fast-drive"]
applies_to: "all"
last_reviewed: 2026-10-01
---

# Once I move files to the external drive, is that the only copy?

Yes — moving frees space precisely because the files leave your Mac. After a move is copied and verified, the original is removed and a shortcut takes its place, so the drive holds the only copy.

That makes backing up the drive important:

- **Backup Drive** (More → Drive) makes a full, verified copy of your working drive onto a second drive.
- **Data Backup** keeps versioned backups of the folders you choose.
- Time Machine can include an external drive if you remove it from Time Machine's exclusions.

Moving is not a backup; treat the fast drive like any important disk. See [Backups](https://storagestudio.us/faq/backups/).