No issue, Each vCenter Server can support up to 10 VDP appliances.Each VDP appliance supports backup for up to 100 virtual machines. Only 1 VDP appliance can exist per ESXi/ESX host. so make sure you have installed those appliance in different host. and more over for same vm guest, schedule the backup in different time do not do it in the same time because once the backup completed the vdp would delete all the snapshots of the vm guest. so there is more chances of another backup snapshot deletiona and backup failure.
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