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Windows 11 backup

Vincent Roscioli III 20 Reputation points
2026-01-15T03:22:22.86+00:00

Windows 11 backup C:/ drive to external SSD drive

c drive has 165GB, SSD drive has 79GB from backup

Question, is the backup compressed?

Windows for home | Windows 11 | Files, folders, and storage
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AI answer

2026-01-15T03:22:29.3666667+00:00

Yes, the backup is likely compressed. According to the Azure Backup documentation, data backed up from Azure Backup Agent, DPM, and Azure Backup Server is compressed and encrypted before being transferred. This means that the size of the data in the vault is typically 30-40% smaller than the original data selected for backup. Therefore, if your C: drive has 165 GB of data and the backup to the external SSD is 79 GB, it suggests that compression has occurred during the backup process.

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