A synology wouldn't be able to run a document management server software though, would it? Specifically Paperless (https://marinersoftware.com/product/paperless/) and MySQL. Source: about 3 years ago

I went through this a decade or so ago when I realized when I was moving that a quarter of the boxes I moved were full of paper. I am currently storing everything in Mariner's Paperless. Https://marinersoftware.com/product/paperless/e Everything is in PDF so easily exportable but the scanner integration and the workflow make everything easier. Source: about 3 years ago

I've been a big user of paperless from Mariner software. https://marinersoftware.com/product/paperless/. Source: over 3 years ago

Get a virtual mailbox service. Examples include ipostal1.com or anythimemailbox.com. You may also choose to get a U.S. Postal service postbox that only you know or have the key to at https://www.usps.com/manage/po-boxes.htm. You can ask a trusted friend to receive mail for you for important correspondence like from government sources. Source: 12 months ago

I did some research and think I've narrowed it down to https://www.anytimemailbox.com/ or https://ipostal1.com/. Source: about 1 year ago

I use https://ipostal1.com/. They can scan or forward docs. I also transferred my phone number to Google voice. Source: about 1 year ago

Ipostal1- I know this is a popular one. Digital mailbox service that lets you choose a mailing address for business or personal use. My only gripe is that you need to fill out a notarization form for each address you use. Source: about 1 year ago

Use a virtual mailing address. It's essentially a PO Box but some also have a physical location to receive mail. I use ipostal1.com for $9/month. Source: over 1 year ago