Tom Nelson is an engineer, programmer, network manager, and computer network and systems designer who has written for Other World Computing,and others.However, like all backup applications, Time Machine is subject to errors and problems that can cause you to worry about your backups.
One problem you may encounter with Time Machine occurs when you see an error message that says, The backup volume is read-only. Despite this message, your backup files are probably in good working order, and no backup data has been lost. ![]() Its unlikely that you accidentally set the drive to be read-only. You cant back up new data to a Time Machine drive that displays the read-only error until the problem is fixed. A few possible fixes exist for this problem, and each takes only a short time to try. If you use an external drive connected to a Mac by USB, FireWire, or Thunderbolt as your backup drive, eject the drive from the Mac. This is the most common solution for the Backup Volume Is Read-Only error. If ejecting and reconnecting an external drive doesnt help, dont reset the permissions because this wont do any good. If the drive cannot be ejected from the desktop, unmount it using Disk Utility. Turn off Time Machine in System Preferences Time Machine and use Disk Utility to run First Aid on the Time Machine backup drive. When the process is complete, exit Disk Utility and turn on Time Machine in the System Preferences. When the repairs are complete, you should no longer encounter the Backup Volume Is Read-Only error message, and your backups proceed as scheduled. In most cases, this one-time problem is unlikely to have any effect on the reliability of your Time Machine drive. As long as the Time Machine drive doesnt continue to have problems that require Disk Utility or a third-party drive utility app to repair the drive, you should be fine. In all likelihood, this was a one-time event, perhaps caused by a power outage or the Mac or Time Machine drive turning off unexpectedly. As long as the problem doesnt repeat, the Time Machine drive should be in good shape. However, if the problem reoccurs, its time to consider a repair to your existing drive or get a new drive to store your backups. Make an appointment at a nearby Apple Store or Apple Authorized Service Provider for repair or replacement advice for the drive.
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