NAS drives aren’t really a valid backup plan - they’re more like a networked version of the other external drives you currently have. However, because they’re always-on-tiny-servers, they enable a few other useful things, notably, backing themselves up to cloud storage.
So, having just overhauled my own backup strategy, I can share:
- I have Dropbox but I mainly use it for collaboration rather than storage.
- I have a Time Machine clone of my laptop that gets done about… once a week. Not quite bootable, but good enough.
- I have Arq running backups of everything in my home folder but iTunes off that machine to Backblaze B2 storage, fairly all-the-time. So that’s offsite versions of key things.
- I also have a 1TB usb drive that, like you, I don’t backup yet. It’s about ten years old and this just feels like a massive liability for all my offloaded photographs, and probably offloaded music stuff too. So my plan is to replace that with a big NAS with a pair of disks mirroring each other (RAID1). RAID is not backup, but it’s a guard against mechanical failure. And then I’m going to let the NAS software also back that up to Backblaze B2.
Coupled with: a lot of my life is online (GMail) or code (Github) and can be recovered somehow via those means.
That covers multiple locations and strategies for all my key stuff, and I think that’s a good start. (Of course, Gary Bernhardt would point out at this point that if you haven’t tried to restore from one of your backups, it can’t really be counted as backup, but I’m a trusting sort).