You shouldn't have issues, just keep in mind, the databases will be upgraded during restore on 2014, so keep the 2008 backups until your migration is signed off as successful.
not sure what you mean with "Will it be intact like aFULL BACKUP without compression is my question."
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This thing is addressing problems that dont exist. Its solution-ism at its worst. We are dumbing down machines that are inherently superior. - Gilfoyle