I would tread very carefully with that one. Facebook does not send a blanket notice to all users that all posts will be deleted unless you manually save them. There’s no real policy like that currently in effect.
It might be a hoax or fake warning circulating on Facebook
There’s a long history of fear-based messages spreading on Facebook where people claim the platform is going to delete everyone’s stuff unless you save it. These are essentially Instagram/Facebook privacy hoaxes that reappear again and again, urging users to copy/paste warnings or claims about deletion ... but they aren’t real policy changes. Facebook has said similar viral warnings about making private content public or deleting all posts are false.
It could be about specific types of content being removed
Facebook has made legitimate changes to how some content is handled ... for example, they changed how long live videos are stored, with old ones being deleted after a certain period unless downloaded. Users got notifications so they could save those before removal.
It might be linked to group privacy or visibility changes
If a group you’re in is switching from private to public, Facebook notifies members and tells them what will change about how future posts are visible. What you post after the change will be visible to more people, but past posts usually remain limited to group members.
It might be a scam or phishing attempt
There are scams out there pretending to come from Facebook, saying your page or content will be deleted and giving a link to “save” or “appeal,” but the links lead to phishing websites that try to steal your login info.
Most people who see those “copy and save all your posts” messages are encountering *either a viral hoax, a scam/phishing message, or misinterpreting an unrelated notification. Facebook does not send a blanket notice to all users that all posts will be deleted unless you manually save them. There’s no real policy like that currently in effect.