> What is the actual difference between a backup and replication? Simplest way to think about it is that a backup must be an immutable snapshot in time. Any ch

> What is the actual difference between a backup and replication? Simplest way to think about it is that a backup must be an immutable snapshot in time. Any changes and deletions which happen after that point in time will never reflect back onto the backup. That way, any files you accidentaly delete or corrupt (or other unwanted changes, like ransomware encrypting them for you) can be recovered by going back to the backup. Replication is very different, you intentionally want all ongoing changes to replicate to the multiple copies for availability. But it means that unwanted changes or data corruption happily replicates to all the copies so now all of them are corrupt. That's when you reach for the most recent backup. That's why you always need to backup and you'll usually want to replicate as well.