Using auto backup with Vim — First published in fullweb.io issue #3

using-auto-backup-vim.md

Using auto backup with Vim

Not using versioning on your configuration files and editing them with Vim? Use Vim’s backup option to automatically keep a copy of past versions:

To put in your ~/.vimrc:

"Turn on backup option
set backup

"Where to store backups
set backupdir=~/.vim/backup//

"Make backup before overwriting the current buffer
set writebackup

"Overwrite the original backup file
set backupcopy=yes

"Meaningful backup name, ex: filename@2015-04-05.14:59
au BufWritePre * let &bex = '@' . strftime("%F.%H:%M")

When I open my vimrc file after adding this snippet, I get:

Error detected while processing modelines:
line   40:
E518: Unknown option: filename@2015-04-05.14

Note: I'm using SpaceVim

... its because the colon in front of "filename@2015-04-05.14". Anyway strange behavior for a "comment"
Remove it oder mask it with backslash.