How can i reset my password from my nsa 325 v2? if forgot my password and id

Yes. And removing the factory reset option from the firmware doesn't help. You can simply pull the disks and read them on any Linux system.

The only scenario where physical access doesn't expose your files is when you use encryption, which is generally not supported by consumer-grade NASses.

An access point generally has also a factory reset button. So yes, a burglar can use your wifi. That is not very important, as he can only change the settings to factory default, and enter new ones, but he can't read your wifi password. (Unless you stored that in plain text on your NAS). So when you come home you'll find you can't use your wifi anymore, and perform a 2nd factory reset, and enter a new password, excluding the burglar.