* Possible values in array:
* 'minute': file is available for one minute
* 'hour': file available for one hour
* 'day': file available for one day
* 'week': file available for one week
* 'month': file is available for one month
* Possible values in array:
* 'minute': file is available for one minute
* 'hour': file available for one hour
* 'day': file available for one day
* 'week': file available for one week
* 'month': file is available for one month