nnBackup 2.2 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most frequent installation filenames for the program include: cmd.exe and nnbackup.exe etc.
The software lies within System Utilities, more precisely Backup & Restore. The following version: 2.2 is the most frequently downloaded one by the program users. We recommend checking the downloaded files with any free antivirus. This program was originally designed by nnSoft XXI.
From the developer:
nnBackup is a small (350k) and convenient command line tool for backing up and synchronizing your files and folders, creating and processing file-lists. When backing up you can optionally compress the data using internal gz/zip algorithms or your preferred external archiver and start specified applications before and after main backup process. nnBackup includes special tools for removing obsolete data from the backup.
You may want to check out more software, such as Simply Backup CDRW, StartDefrag or SAFE Block, which might be similar to nnBackup.