Backup performance issues are hard to rectify without monitoring what is happening during backup. What I have noticed on older AIX servers (like 7025-6F0) is that beremote is quite CPU-intensive, so it may be your case if you are backing up, say, 7025-F50. I would suggest taking a sample backup and running nmon in statistics mode (nmon -f) or, if you got time, just watch interactively during backup (start nmon and press c, n, d for CPU, disks and network interfaces). Then watch disk load, network load and CPU usage - one of them may be your case's bottleneck. It could be that your backup scenario involves a LOT of small files and this is not handled well by beremote, to my experience.
