I’m looking to create a small offsite backup for 1-2 terabytes of from my NAS, mainly photos. I was planning on getting a mini pc off of ebay, putting a large ssd in it and then connecting it to my NAS via tailscale (which I already use) and leaving it at my parents house. For them this would functionally be a black box, they are not tech savvy and would not interact with it. I have pretty good upload speed and would probably only do a monthly backup.

Are there any additional pitfalls/security risks to this? Some obvious concerns:

Someone taking the SSD: None of the photos are sensitive, so if someone got access to the mini pc I would just remove it from the list of devices on tailscale.

Someone accessing my network via the mini pc: I know there is a chance that someone uses the sff pc to access my network, but personally I think that is an acceptable risk.

Single data drive in the sff pc: I’m trying to this easy for my parents, just plug it in next to their router and be done with it. I don’t want to step up to a small tower with space for multiple drives.

How secure is tailscale? I know that “anything open to the internet is accessible” but I’m just looking for a reasonable level of security. If some bad actor really wants onto my network in particular I’d assume they’re going to get in.