In resume, my questions are:
1 - for the backup transport network, on the iscsi/backup distributed switch i will have to create a port group tagged as VLAN10, used for backup transport and a 3rd vmkernel on each host, with address 192.168.1.x, right? But in this situation i will have more than one vmkernel on the same network (multi-homed), will this work? Or for backup transport it's better have other subnet?
You do not need a third vmkernel port on each host. The backup proxy will need to be connected to a port group tagged for this VLAN11 (not sure why you said 10 above) in order to be on the same L2 as the backup repository (target).
2 - With or with out the same network for iscsi and backup transport, for iscsi traffic i will have a one to one relation, but beside that, for the port group group created for transport backup, i will have the two uplinks active on the teaming and failover options, right?
You will not be able to use your two pNICs on each host to send traffic to the target since those are being used as vmkernel port bounding for iSCSI.
Your proposal doesn't make a lot of sense. If the VMs you wish to protect are not on this iSCSI storage you do not need to have vmkernel ports on the host for your backup proxy to send data to the iSCSI repository. Your backup proxy would just need to be connected to your iSCSI mount either directly through the OS as a block device, or whatever means IBM offers for its software. But there again, I recommend you to consult IBM in some way when it comes to proper architecture. Saying that it is "very similar to Veeam" isn't good enough if you want the best outcome.
