In order to teleport someone/something from point A to point B, it requires a super nano-tech to copy the details of the person/thing and then transport to another location.
Upon the receiver got the copy information, there must a need to compute the checksum to validate the copy.

Once the checksum is validated, the person/thing can be reconstruct at point B without any issue.
If there is a system failure, then it's sayonara to that person/thing or stored in the memory...

Now, this is interesting... if the transporter can copy the details of the person/thing, then the information is definitely store in a memory in order to bring to point B. Therefore the system can copy one/many person/thing out of thin air...