Looking to get a NAS but don't want to spend too much starting out. I have the opportunity to buy a used custom built NAS with much better specs than what I would probably be able to get from something like a synology NAS. It seems like a really good deal but I'm not sure how difficult/time-consuming it will be to configure for my use case or if it will be better to stick to synology software. Also, is the software to use the NAS after configuration not user friendly or well supported?

My use case is to store photos and videos and device backups from time machine for my mac. I'd also like to be able to remotely access the data over the internet.