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@@ -5,20 +5,20 @@ When a fixity check fails, APTrust sends an alert to Institutional Admin users a
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## High Assurance
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- This class includes two copies:
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-**Hot copy (S3)** – used for regular access and fixity checks.
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-**Cold copy (Glacier)** – used as a second copy.
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-**Hot copy (S3)** – used for regular access and fixity checks.
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-**Cold copy (Glacier)** – used as a second copy.
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- Fixity checks are performed on the hot (S3) copy.
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- If a fixity check fails:
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1. Contact APTrust support.
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2. We will work with you to restore the Glacier copy.
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3. We'll verify the Glacier copy's fixity.
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4. If valid, we’ll replace the corrupted S3 copy with the Glacier version and record a PREMIS event.
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1. Contact APTrust support.
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2. We will work with you to restore the Glacier copy.
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3. We'll verify the Glacier copy's fixity.
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4. If valid, we’ll replace the corrupted S3 copy with the Glacier version and record a PREMIS event.
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## Basic Archive and Deep Archive
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- These classes store **a single copy only**.
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- If a fixity check fails, the object cannot be recovered by APTrust.
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- To remediate:
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- Deposit a new version of the object.
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-Use an [update bag](updates.md) to replace the corrupted file in preservation storage.
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1. Deposit a new version of the object.
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2.Use an [update bag](updates.md) to replace the corrupted file in preservation storage. You only need to include the impacted file (keeping the same file name and path).
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