Apple released MacOSX new version 10.6, code name "Snow Leopard".

Refined 64bit support and Grand Central Dispatch apparently make user experience faster than ever.

It is worth to upgrade if you use 64bit cpu. Even if your CPU is core solo or core duo, it is better to install Snow Leopard.

I did forget that rsync with --delete option deleted data in the backup directory while rsync is building first index.

After I reconstructed my backup RAID on the server in my local network, I executed rsync --delete then it deleted all backup data. It was too late when I was aware of it.

It is better to do it with --dry-run when you rsync at first time.