At least with office 365 you can save to older, less apt to be excluded from formats like doc. Personally I save everything in the old doc/xls/ppt formats. I hope they keep them around for a while. Mostly these days though I just have a server at home that I can vnc into and use openoffice. All that stuff gets backed up to backblaze. it's not as nice as google or office365 but it's mine and I control it and I won't be revoking my account on an AI whim.