Given the rise of ransomware in the recent months, what protection does Arq offer against that? That thing alone would easily tip the scales for me versus the Time Machine. I see that the AWS S3 IAM user has both read and write access, so if the ransomware authors ever bother with it, they can kill the backups. Would that help if I setup versioning on the bucket? Will Arq be able to restore backups from the older ver…
Both Arq and Time Machine create differential backups. Thus, any particular backup can be restored back in time. However, Arq targets non-file-based media (although you could trick it by a little SSH magic). Time Machine requires file-based access.
If ransomeware finds your file-based backup, it will encrypt it and render your backup useless.
The term backup gets bandied about, so it can mean one or more of the following: high-availability, synchronization, and/or disaster recovery. You'll want to look into these and the concept of the 3-2-1 method.