small fix to get 24 hour notation. Use capital HH.
dateFormat = require('dateformat')
ts = dateFormat(new Date(),"yyyy-mm-dd_HHMMss")
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All, the pimatic-backup plugin is updated with the (24 hour) timestamp fix.
As an extra option I developed pimatic-save. A plugin to save files on a rule based way, to a backup medium like FTP or Dropbox.