I already own the paid version of Macrium Backup. But for peace of mind I was thinking installing a 2nd program like AOMEI free. Would there be any interference between them since I have Win PE installed? Thanks in advance for advice.
I'm not sure what you mean by having "WinPE installed," but there should be no issues associated with multiple imaging programs being installed at the same time... many on this Forum do exactly that.
@Antarctica -- I'm guessing that you may be asking whether WinPE boot options for both of them can co-exist in the same system boot menu. If that is your concern, the answer is definitely yes you can have more than one such WinPE boot option with no problem at all. In fact, it's even possible to create a single WinPE recovery environment that includes both together, but that's a whole other story.
I have always used two backup programs and have no regrets. If one fails, the other one is there to save you. Has that ever happened to me? You betcha but not very often.