Failing to create backup for migrating

I’ve been using a Pi 3 with HASS OS which worked great until like May 2024. Then past few months, automations and etc. worked but the UI was noticeably slow. And for the last week, starting addons, modifying config and even just entering the Web UI caused crashes. I also have a Pi 4 which is already in use with various Docker’s running, so i started moving into it. I installed successfully. But when I try to create full system backup on Pi 3, it just crashes as I told. I can’t get the file to migrate. I really need advices about this. What should I do in this situation?

Edit: I forgot to add the logs and error message. It says “Unknown error, see supervisor” on the backup popup and then system crashes. For the logs, the problem is here. There are two integrations that gives error and they give these errors periodically. So I don’t really think it’s related to backup.