> I wonder if UFS has better performance or not. Or can you suggest
> another fs? Just of the PGDATA directory.
Relying on physically moving a disk isn't a good backup/recovery strategy. Disks are the least reliable single component in a modern computer. You should figure out the best file system for your application, and separately figure out a recovery strategy, one that can survive the failure of *any* component in your system, including the disk itself.
This is why I use a RAID array of 10 disks. So there is no single point of failure. What else could I do? (Yes, I can make regular backups, but that is not the same. I can still loose data...)