public static FileInfo[] GetUnnecessaryPrevalenceFiles(PrevalenceEngine engine)
{
FileInfo[] all = GetPrevalenceFilesSortedByName(engine);
int lastSnapshotIndex = FindLastSnapshot(all);
if (lastSnapshotIndex > 0)
{
return GetFileInfoRange(all, 0, lastSnapshotIndex);
}
else
{
return NullCleanUpPolicy.EmptyFileInfoArray;
}
}