Never heard of Scaleway...those prices seem to beat the pants of DigitalOcean. Might have to look into that, thank you for mentioning.
The Mastodon instance I use is hosted at Scaleway. It's had multiple multi-day outages due to failures at Scaleway's end.
Cheap is great and all, but this experience has not been the kind that would lead me to recommend using Scaleway for any service you need to be reliable.
I'm working on a guide on how to setup a replicated fault tolerant email cluster (galera/dsync) here [1] -- feedback appreciated.
This costs far more than something like fastmail, however. Depending on your situation you might value cost over peace of mind.
1: https://medium.com/@cyberpunk_networks/nsa-proof-your-email-...
Unfortunately, with Galera, you're not even a hardware failure away from losing / corrupting email.
https://aphyr.com/posts/327-jepsen-mariadb-galera-cluster
> Unfortunately, even in totally healthy clusters, with no node failures or network failures, Galera Cluster does not satisfy its claims of Snapshot Isolation.
I'll add a section on recovery, but even with a few hundred thousand email inboxes my database size is likely to be under 100mb and backing that up will cause no issues in live since I'm only doing SELECT 99.99% of the time; each of my nodes dumps the db into /var somewhere every hour.