The Dominion voting system and other vote counting systems are very easy to hack. They were designed to be easily hacked and to be able to manipulate the results. The inventor of this system in Venezuela said he managed to add a million new votes to ensure that Maduro is re-elected. This is the same software that has been used in many states in the USA. The idea is that it is easily hackable to manipulate election results, and it is all easy to do.
During the election day there was a spike of votes for Biden after the machines were updated.
Postal votes are not responsible for this spike. This is what the engineer from Venezuela says. The count in these states was interrupted. The countdown has never been so late before. The reason is that the people who took care of the count had discovered that the forms in the machine were not enough to overthrow the majority for Donald Trump. So they had to stop the count and restart the machine with a new formula sent to them over the internet. When they revived the formula it was much faster and favoured the Democrats much more, which is why there is this spike. It is not because of the postal votes. They were not all counted at the same time. The problem is that the machines have been changed so that there are more votes for Joe Biden than for Donald Trump.