What controls did you have in place so you were not a SPOF for your client? I myself am struggling with this with a few of my consulting gigs: I need to find

What controls did you have in place so you were not a SPOF for your client? I myself am struggling with this with a few of my consulting gigs: I need to find someone as a backup who can stand in for me when I need to spend time with family, go on trips, or am generally unavailable ....