The WHS team has solved a software bug that can affect Files on a home computer that are compressed by using NTFS compression may not be backed up correctly by Windows Home Server. The Knowledge Base (KB) article explains that if you try to restore a compressed file from a WHS backup, the file may be corrupted. This is because under certain circumstances, a compressed file may consume more disk space than the original file size. Some sections of a file may use less disk space after NTFS compression. However, other sections of a file may use more disk space after NTFS compression. If the compressed file uses more disk space than the original file, a small amount of data at the end of the file may be lost during the backup process. This data loss results in a corrupted file or a partially-corrupted file, depending on the corresponding file types. The file types that may be affected by this issue include, but are not limited to, CAB, ZIP, JPG, and PNG.
An update package is available for download as well as via Windows Update that corrects this issue but remember that backups that were created before the update was installed may still contain corrupted files if the backups used NTFS compression.
