Currently when you failover to a replica, the backup server needs to have the same amount of memory as the production server. There is no where to configure an option to boot with less memory similar to how Surebackup allows you to do this. Modifying the memory setting in Hyper-V Manager simply gets overwritten by Veeam during the failover.
We often re-purpose old servers to act as Veeam Backup servers and they usually have less memory compared to the production server.
I know it's ideal to upgrade the memory on the backup server but it sure would be nice to have the option to boot with less memory