• Object Storage Service

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  2. Object Storage Service
  3. User Guide
  4. OBS Console Operation Guide
  5. Managing Objects
  6. Restoring a Cold File on OBS

Restoring a Cold File on OBS

You need to restore a Cold object before downloading it, accessing it using its URL, setting ACL permissions or object metadata for it.

Restrictions and Limitations

  • If a Cold object is in the Restoring state, you cannot suspend or delete the restoration task.
  • You cannot re-restore an object that is in the Restoring state.


  1. In the bucket list on the OBS Console, click the target bucket to go to the Summary page.
  2. In the navigation tree on the left, click Objects.
  3. Select the file you want to restore, and click Restore on the right. The following dialog box shown in Figure 1 is displayed.

    You can select multiple files and click Restore above the file list to batch restore the files.

    Figure 1 Restoring an object

  4. Before restoring objects, you need to configure the validity period and restoration speed of the objects. The following table describes the parameters.

    Table 1 Parameters for restoring objects




    Name of the object to be restored.

    Storage Class

    Storage class of the object to be restored.


    The file size of the object to be restored.

    Validity Period

    Time duration when an object remains in the Restored state after being restored. The timing starts as the object restoration is completed. The value is an integer ranging from 1 to 30 (days). The default value is 30.

    For example, you set Validity Period to 20 when restoring an object. After 20 days starting from the time when the object is successfully restored, the object's status will change from Restored to Unrestored.


    Restoration speed of an object.

    • Expedited: Allows you to restore the cold objects within 1 to 5 minutes.
    • Standard: Allows you to restore your cold objects within 3 to 5 hours.
    • Bulk: Bulk retrievals are the lowest-cost retrieval option of OBS, enabling you to retrieve large amounts, even petabytes, of data in a day at a low cost. Bulk retrievals typically complete within 5 to 12 hours.

  5. Click OK.

    The Restore column in the objects list displays the restoration status.

    You can click the to manually refresh the restoration status.


    The system checks the file restoration status once per day at 00:00 (GMT±00:00). The expiration time is counted starting from the time when the last check was complete.

Follow-up Procedure

Within the validity period of an object, you can repeatedly restore the object. The validity period of the object is counted starting from the time when the latest restoration is completed. By doing so, you can prolong the validity period of an object.


If an object is to be restored for a second time, the expiration time set for the second restoration must be later than that set for the first restoration.