I learnt this the hard way after all admin accounts for my business manager got disabled last year leaving me no access to my business manager, pages and ad accounts. If you’re wondering why that happened, then it can happen to anyone who uses Facebook for business. It’s AI after all. If the data points they have on you flag you in anyway, which by the way happens all the time, they are going to erase you.
Luckily, there are things that you can have in place in order to protect you from the catastrophic affects. I learnt it after losing access to everything. You don’t have to do the same.
All you need to do is generate a business manager admin invite to an email address that you own. Keep the invitation pending and do not sign up as admin on the business manager. In an event everything gets disabled, your pending invitation will not be disabled. You can then accept your invitation and gain access to your BM and all associated assets.
The fine print though is that invitations expire every 30 days, so you need to do this once a month. I do it and it’s worth it.