#OpenBSD friends - I need help with backups.

I make backups on external USB disks. Now what tool should I use? I don't need any deduplication and stuff like that.
What I need is quick restore procedure.

So what should I use ? I was thinking rsync or dump/restore.

What would you suggest considering above ?

@as400 i described my personal backup workflow including tooling in https://xosc.org/timemachine.html you have an initial setup effort and then you just connect your external stick or disk.
Time Machine like Backups on OpenBSD