301 redirect

Hello. I had two plugins for redirects and I had to remove one of them. 301 was done in one of the plugins about two years ago. I got the output list. And deleted. The redirects are OK and there is no problem. But the question I have is that after a while, the 301s done may return to the previous state
I mean, do I need them again in the new 301 plugin? Or are the 301s registered and the removal of plugins is not related to them?