Use aho bakaup with Fern - aiya000/aho-bakaup.vim GitHub Wiki

Use the following Vim script to use fern.vim instead of Netrw on BakaupExplore command:

function! s:init_bakaup() abort
  command! BakaupExplore execute printf("Fern %s", fnameescape(g:bakaup_backup_dir))
  silent! delcommand BakaupTexplore
  silent! delcommand BakaupVexplore
  silent! delcommand BakaupSexplore
endfunction

augroup bakaup
  autocmd!
  autocmd VimEnter * call s:init_bakaup()
augroup END