ZFS on small systems

[Anselm Strauss]

Hi,

I'm interested in using ZFS on one of my small systems with 256 MB of  
RAM and 4 GB flash disk. Since ZFS is now considered production ready  
on FreeBSD I would like to use it as root filesystem and profit mainly  
from the cool snapshot features for easy backups.

I found multiple recommendations to run ZFS only on systems with  
enough resources. But is this only a requirement if you want good  
performance or also for ZFS to function properly at all?

Thanks for any thoughts on that.
Anselm