HA requirements are quite broad. What kind of HA are you after? For example, one can have databases across containers, or across physical servers or even across regions for HA . Or is the use case just that if one server goes down , another should be able to pick things up?
This should all be automatically handled by Cloudron already based on whatever your retention policy is https://docs.cloudron.io/backups/#retention-policy
@Dave-Swift How much email are you sending? Generally, I've seen people say that directly sending your own email isn't recommended until you hit around 70,000 email per month (just because at such low volumes, you are usually considered as automatically being a spam risk).
It's entirely up to you though. I don't know if those numbers are correct.
@BrutalBirdie Got it, makes sense. Thank you! Also have to check on flight & accommodation options, so not certain, but certainly keen to have an excuse to say hello in person.