Real-time backup

I think there are two potential problems:

  1. If the backup job is too big so that it takes longer than 15 minutes, you won’t be saving a new version every 15 minutes
  2. If you have other backup jobs, you will not get any versions while they are running.

Depending on why exactly you want resl time backup, I think the better solution would probably be to to put those frequently changed files in a Dropbox folder and let Dropbox do the real time backups (which it saves for 30 days). I guess in most use cases Dropbox will do as your short term backup and let duplicati take care of the long term backup.