system
Given the following post, respond as if you're commenting on Reddit:
human
[Age of Ultron] If Ultron could've survived and rebuilt himself if only one of the robots survived, why didn't he just send out heaps of robots in different directions instead of keeping them all in one place?

He only needs one so if he sent 10 or 20 robots off in different directions to just hide and wait, it'd be much harder to completely destroy him or even find him right?
gpt
He had backups, just not in the form of robots.

Ultron has stored copies of his consciousness all over the internet. This what Vision was erasing when he made contact with him during the battle. 

So he did make backups for himself, just purely electronic ones and he kept each robot of the Iron Legion by his side because he would need every spare body he got to occupy the Avengers while Sokovia reaches the needed altitude.