Should I upgrade RAM and Drives on DS218j Diskstation

[Enquiries]

Thanks for all the info you provide! I am wondering if it worthwhile upgrading my NAS RAM to whatever the maximum is? Probably un-soldering/soldering RAM will discourage me from attempting with my DS218J model. If I can do that, how large can the hard drives be if I choose to replace them? I am running out of space fast. Thanks in advance for any help you provide!