Usually you can get a new NAS really cheap on Black Friday. Even today you can get a 119j for $103, which isn't much more than a rpi with card and case.
Yeah I use as backup, and it syncs to the cloud. So I figure if it dies I'm still good as I have the original and cloud. It also means I dont have to pay for 2 disks or think about RAID. It is slow and there is a learning curve but mostly just works and is very low power - at it shuts down disk when not in use.
https://www.newegg.com/synology-ds119j/p/N82E16822108418