Data is zipped in a Mac OS X environment and sent to a Windows environment (older than 8.1). The data is extracted there, and when the extracted folder is subsequently included in the backup selection, the backup fails.
When images are zipped (compressed) in a Mac OS X environment and then unzipped and extracted in a Windows environment using Windows' built-in extraction tool, the created folder contains a folder named __MACOSX. This folder is not visible in the Mac environment in which the images are initially zipped.
The POSIX attributes of the extracted files' attributes overlap with the Windows attributes, which causes Windows to read the folder and its contents as encrypted (green), even though they are not. When the the backup client backs up the unzipped folder, it will also try to back up the __MACOSX folder, which will fail with errors.
- The folder name starts with a double (not single) underscore.
- Third-party extraction tools such as 7Zip, Winzip and Winrar do not cause this issue.
The problem has been fixed by Microsoft, but only for Windows 8.1 and later. For earlier versions, the solution is to exclude the __MACOSX folder from the backup selection. This can be done in one of two ways:
On the Storage Platform Management Console
1. In the Account Management view, right-click on the relevant backup group name and click Configure.
2. In the dialog box that appears, go to the Profiling tab. Ensure that the Enable profiling checkbox is ticked.
3. Expand the Global Exclusions node under Available Options (Not Enforced) and click Exclusion Filter.
4. Add __MACOSX as a value in the dialog box that appears, and click OK.
On the backup client
1. Click on Options in the toolbar at the top and go to Backups > Global Exclusions.
2. Under Exclude Folders, tick the box Exclude these folders (one per line) and add __MACOSX in the available field. Click OK.