One of the chief concerns of exhumans is motivation traps: any form of ego modification that causes an ego to be unable or unwilling to undo the modification (with the implication that the modification is harmful or sub-optimal). Sometimes a motivation trap takes the form of a fundamental cognitive malfunction, and the modified ego is unable to look after itself, much less undo its mod. The more feared traps are subtle, taking the form of a shift in fundamental attitudes and motivations.
For these reasons, it is standard practice among cautious exhumans to maintain and keep running a backup of its last stable version of itself. The backup oversees all experimentation and modification, testing the resulting modified thoroughly before accepting any changes into itself.
Plot Hook: Exhumans do a lot of dangerous experimentation. How often does a well-armed Firewall/Ozma team fight past the automated defenses of an exhuman brinker hab, only to find that its owner long ago removed itself? Firewall has tasked the players with tracking down an exhuman threat. When they breach its isolated hab, they find that it accidentally rendered itself catatonic months ago and starved to death; its progeny, however, are very much alive.