N_360backup folder is for Norton backup. If you have the same backup on Carbonite, you may delete it.
If you would like to check the contents, you can try to restore the files through Norton 360. Here is the KB article for your reference: Restoring the files or folders.
If you want to use Norton backup and there is an external hard drive available, you can set the location as the external hard drive folder.
If you would not like to use it, disable it.
Hope this helps.
Thanks and Regards,