hey goven, like GRJ said about the speeds, i have the QNAP 219P and 459 Pro and the speeds blow the 323 away but so they should as they have more memory and a faster processor and are also more money ....
hey cliff ... the QNAP has a built-in backup that uses rsync and will do incremental backups, you can backup to a usb or drive as well and you can also install a lot of different backup softwares like symantec backup exec, etc so you would be able to get what you are looking for out of the QNAP ... i am sure GRJ will also say you can get the same out of the Synology as they are in the same league with features, price, etc