// and then running stable sort by last backup date.
sort( leftovers.rbegin(), leftovers.rend(), FileData::sizecmp );
stable_sort( leftovers.begin(), leftovers.end(), FileData::lastbackupcmp );
// and then running stable sort by last backup date.
sort( leftovers.rbegin(), leftovers.rend(), FileData::sizecmp );
stable_sort( leftovers.begin(), leftovers.end(), FileData::lastbackupcmp );