hyperpac

Hello folks, I´m using sync for a rather large folder (~20 TB) and I wonder why sync has to re-index the folder after a version upgrade (in my case now from 1.3 to 1.4). Re-Indexing large folders like this really takes a quite long time (on my Xeon machine around 1 day, on the slower Opteron machine nearly 2 days). Isn´t there a way to keep the index when upgrading or am I doing something wrong ? Thx !