Your External Backup Drive Should Not Stay Connected All the Time

An external hard drive or SSD can be an excellent way to back up a computer, but there is an important detail people often miss: if your only backup drive stays connected to the computer all the time, it can be exposed to some of the same problems as the computer itself.

That includes accidental deletion, electrical problems and some forms of malware or ransomware that can reach connected storage.

A backup should be a separate copy

Copying important files to another folder on the same computer is not enough. If the internal drive fails, both copies can disappear together.

An external drive creates physical separation, but that advantage is reduced if the drive is always plugged in and writable.

For a simple home backup routine, connect the drive, run or verify the backup, safely eject it, and store it somewhere appropriate until the next backup.

Safely eject before unplugging

On Windows, use the Safely Remove Hardware or Eject option when appropriate before disconnecting the drive. On macOS, eject the disk in Finder before unplugging it.

This reduces the chance of disconnecting the drive while data is still being written.

One external drive is better than no backup, but it is not perfect

Important data deserves more than one failure path. A commonly used principle is to keep multiple copies of important information on more than one type of storage, with at least one copy separated from the main computer.

Cloud backup or storage can provide another layer, depending on the service and how it handles deletion and version history.

You do not need an elaborate business backup system for ordinary family files. You do need to make sure that a single broken computer, stolen bag, malware infection or accidental deletion cannot destroy every copy at once.

Test the backup

A backup is only useful if you can recover from it. Occasionally open a few backed-up files and verify that they are readable. Know where the backup software stores files and how restoration works before an emergency.

The goal is not simply to own a backup drive. The goal is to maintain a separate, recoverable copy of the information you care about.

Sources and Further Reading

CISA — StopRansomware guidance and backup recommendations: https://www.cisa.gov/stopransomware