Known issues
Below is a list of known Alcion issues and limitations:
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Alcion supports Exchange (email, calendars, contacts), OneDrive (files), SharePoint (Document Libraries), and Teams (Chats). Additional data types and services will be added in subsequent releases.
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Backups of Exchange email may not include changes to the read status of an email if no other changes to the email have been made since the previous backup.
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Backups of Exchange contact don't include the contact photo.
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Exported emails don't include custom attachments. Support for custom attachments will be added in a subsequent release.
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Exported events don't include item and reference attachments. Support for item and reference attachments will be added in a subsequent release.
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Inline attachments for exported events will be treated as regular attachments, except the attachments won't retain their name.
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Restores of nested attachments within Exchange Mail or Calendars aren't yet supported.
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Folders and Calendars containing zero items or sub-folders aren't included in the backup.
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Provides no guarantees about whether data moved, added, or deleted in M365 while a backup is being created will be included in the running backup. Future backups run when the data isn't modified will include the data.
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When an event is exported into a PST, any timezone values for events other than the ones documented by Microsoft here will be ignored with UTC being used instead in its place.