S3 SLA is actually for only three nines (99.9%) or 8.76 hours / year or 43.8 minutes / month of downtime: https://aws.amazon.com/s3/sla/
CloudFront offers the same availability. Many CDNs offer no more than three nines. Some claim 100%, but there will eventually be faults. Most do really well to not have recognized outages, but I nonetheless think they offer 100% to guarantee so that you always get credit for any downtime rather than guaranteeing they are never down.
CloudFront offers the same availability. Many CDNs offer no more than three nines. Some claim 100%, but there will eventually be faults. Most do really well to not have recognized outages, but I nonetheless think they offer 100% to guarantee so that you always get credit for any downtime rather than guaranteeing they are never down.
You can look at replicating files to multiple providers; the following shows what kind of uptimes you can expect from the big players: https://cloudharmony.com/status-1year-of-storage
If you can live with read-only states with CDN; a similar report: https://cloudharmony.com/status-1year-of-cdn