Woah! Yeah it is! Well nearly. I pay $50/yr for my email. Obsidian is $48/yr for sync. My email even comes with WebDAV which if it were a better protocol could do the syncing! Haha

Also Obsidian but with syncthing

Maybe it’s diff presented as versions? I use hyper backup on Synology.

Similar to these steps:

https://gist.github.com/mrl22/476d710fea63d71a770d0d44ca54325a

3,2,1.

My nas is a Synology with raid.

1. Backup with versions to a single large HD via USB. This ransomware protection or accidental deletion. (Rsync)
2. Offsite copy to backblaze b2.One version. (Rsync) (~$6/month) This would be natual disaster protection. flood, fire.
3. Second not raided cheaper Synology at a friends on the other coast. This has ~3 versions. Sorta the backup to the first two.