private async Task DeleteContents()
{
var files = ScanHelper.GetFiles(SourceDir, keywords: Keywords);
var subDirectories = ScanHelper.GetSubDirectories(SourceDir, excludeEmpty: ExcludeEmptyDirectories);
if (Frequency == FrequencyEnum.AfterDays)
{
files = ScanHelper.FilterFilesByAge(DayLimit, files);
subDirectories = ScanHelper.FilterDirectoriesByAge(DayLimit, subDirectories);
}
ScanHelper.DeleteFiles(files);
ScanHelper.DeleteDirectories(subDirectories);
}