This has been discussed many times, and the effort to share residues is much more than the work saved by aborted tests.
The people serious enough to do more than 24 hr of work on an exponent are also often resourceful enough to copy a Prime95 folder to another computer if something fails to finish a test. So, the use case for managing residue files is pretty small. It also adds a whole bunch of bandwidth, which is not free for every user.
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