Whilst not exactly possible to convert Nokia backups from .arc files to .nbu, you should be able to extract the data from both and deal with as you need. This can be done with small utilities like Nokia NbuExplorer or similar. You probably won't find a straight arc to nbu converter.
Home > Search converters: arc to nbu
Conversion of arc file format to nbu file format beta
Search for arc to nbu converter or software able to handle these file types.
Convert Nokia backup archive to Nokia PC Suite 6.82+ backup.
We have found one software suitable in our database for this conversion.
Microsoft Windows software 
- convert arc to nbu on Windows
Nokia NbuExplorer
A free explorer for Nokia NBU files
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from arc file | No | No | No | No | No | Yes | No | No |
to nbu file | No | No | No | No | No | Yes | 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.
Additional links: Open arc file, Open nbu file
ARC
Files with arc file extension can be found as backups produced by certain Nokia phones based on Symbian OS. Can be recovered using Nokia PC Suite.
NBU
Files with nbu file extension can be usually found as old Nokia phone backups made using Nokia PC Suite 6.82 and higher.
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