Apparently archives made using Nero BackItUp (.nba) are just renamed ZIP compressed archive and such can be extracted or even repacked in most file archiving utilities, because ZIP is one of the standards. You can thus repack .nba files to .rar should you need it, but it won't be possible to recover using the original program after that.
Convert Nero BackItUp archive to WinRAR RAR compressed archive.
We found one software available in the database for this conversion.
Microsoft Windows software - convert nba to rar on Windows
One of the oldest and most popular shareware file archiver and data compression utility
Convert from nba file format
|Yes, WinRAR supports rar file conversion as a target file type.||Yes||Yes||rar editor||Yes||No||No||Yes|
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.