Is pricing based on machines or data volume?
Both models exist — you choose.
Option 1: per-machine licensing. A licence per protected server, whatever its volume. Maximum budget predictability: the cost follows your fleet’s size, not your data growth.
Option 2: volume-based pricing. You pay for data actually stored, measured after deduplication — identical blocks across snapshots and servers are billed once. This typically favors fleets of many small servers, or environments with highly redundant data.
Two principles apply in every case: your consumption is visible continuously in the console, and backups never stop when a quota is exceeded — you are alerted and the excess is billed per your contract terms, because an interrupted backup is a risk no one should carry.