Reading MTF Backup Files

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Introduction

We use the NTBackup utility to backup our files at the office. Recently, one of the backup files turned out to be corrupt. Searcing for a solution, I came upon William T. Kranz's freeware ntbkup utility. Although ntbkup did a great job recovering the backup file, it is a command line utility. So, I decided to write a backup reader with a GUI.

Background

Volume, file, and folder information in a MTF backup file is stored as so called Descriptor Blocks. MTF is a linear file format. Reading a MTF backup file is a straightforward process. A backup file contains Data Set Descriptor Blocks, which are followed by Volume Descriptor Blocks. Volume Descriptor Blocks are followed by Directory Descriptor Blocks, which are in turn followed by File Descriptor Blocks.

Each descriptor block is followed by one or more Data Streams. Data streams are used for various purposes. They can be used for padding, storing checksums, long file/folder names, etc. One or more data streams associated with a file descriptor block typically contain file data.

Using the code

// Open the backup file
CBackupReader mFile = new CBackupReader(mFileName);
// Read the catalog
CCatalogNode node = mFile.ReadCatalog();
// Extract a node from the catalog
node.ExtractTo(mFile, mTargetPath); 

Limitations

• Backup Reader was tested with a few relatively small backup files. The largest backup file tested was about 2 GB.
• Compressed and encrypted archives are not supported.
• Backup Reader works on Windows archives only. Although descriptor block definitions for other operating systems are included in the source code, they are not tested.
• Archives that span multiple tapes/disks are not supported.

References

1. ntbkup - William T. Kranz's freeware backup utility
2. MTF specification and a Linux backup reader with C source code

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)