You have an on-premises virtual machine named VM1 that runs Windows Server.

Azure Site Recovery ' s replication policy for protecting on-premises Hyper-V virtual machines by replicating them to Azure is built on top of the underlying Hyper-V Replica engine, and the Copy frequency setting exposed in that replication policy offers only a small, fixed set of selectable intervals rather than an arbitrary custom value, with the shortest of those available intervals being 30 seconds. Selecting 30 seconds for the Copy frequency setting therefore configures the replication policy to send VM1 ' s changed data to Azure as frequently as the underlying platform allows, which produces the smallest achievable recovery point interval and the least amount of potential data loss in the event of a failover, directly satisfying the requirement to replicate changes as often as possible. Values shorter than 30 seconds, such as 15 seconds, are not among the set of supported choices for this setting at all, since the Hyper-V Replica engine underlying this replication policy was not designed to support sub-30-second replication cycles, and the 1-minute and 5-minute options, while valid selectable choices, both replicate less frequently than the 30-second option and would therefore not satisfy the requirement to minimize the interval between replication cycles as much as the platform supports.