nvim cannot save - E506: Can't write to backup file (add ! to override)

Question

When I try to save a file I receive the error

E506: Can't write to backup file (add ! to override)

It's working if I use :w!

I'm using neovim.

Answer 1

:se backup? backupdir? backupext? 

Use this comand to find the folder used for backups.

Then create the backup folder:

mkdir ~/.vim-tmp