I agree. Unraid is great because it is user friendly and easily scalable. I started using it a few years ago just to set up a NAS with two HDDs and a Plex library and now have over 50 containers and 8 drives. That’s the beauty of it. You want more drives, just add one. I feel like TrueNAS is probably technically better but this feature was really important to me because I had a feeling that scaling up would be in my future.
The community is very supportive and SpaceInvader One is an amazing resource, as well as Trash (SIO is not trash, Trash is the name of another resource lol)
Or you could encrypt the snapshot before it goes to sleep.