Crashed twices, erasing all files

Recently I started to use Chronosynch Express to synchronize the ~/Document directory of my macs.
The first problem is that it is too slow on my LAN, so I have to synch via USB key or SDXC card.

The second problem is way more serious, as it concerns data integrity.
Chronosynch Express crashed twice, and in both cases I had a large part of ~/Document erased.
Worse, it propagated deletions to the other mac without giving a warning.
Same if you abort it intentionally.

Fortunately, the Time Machine saved my files.

Now I am looking for a replacement.

Sir Launcelot du Lac about ChronoSync Express, v1.0.4