If its a mission critical use, I would stick to a more common TLD (com, org, net, etc). Country TLDs should be okay too.

Also worth noting that they themselves are an American company for anyone that is concerned about that.

Does anyone have a good recommendation for an S3 provider? I’m looking at Hetzner and OVH.

Long time customer and super happy with Fastmail. Its a bit pricy but the service is great.