Started using Obsidian last week. It's so easy and works how ever you want it to. Roam Research is nice, but it's geared toward a specific way of writing.
Also, the Syncing across devices they provide for $4/m right now is a steal and very effortless.
Of course you can take backups using Git, very easy.
I had used Obsidian - when it was all local file - for a while and switched to Roam because I could use it across my devices; going to try out Obsidian again because of the Syncing that's now available (and I was too lazy to get it set up with some stupid/janky rsync attempt on a box/drive folder).
Definitely liked Obsidian's ecosystem a lot more than Roam's so I'm excited to give it another shot now that my one missing - but needed - feature is now available.
Also, the Syncing across devices they provide for $4/m right now is a steal and very effortless.
Of course you can take backups using Git, very easy.