I agree, though I think your language comes across as being more complicated than it has to be. If you use Google Drive or something similar, have at least one computer which does a full sync via the default client. To be more secure, set it up so that you have it sync every week or so to protect against accidental or malicious cloud deletion. Having the sync offset probably isn't super necessary since the issues you bring up are most likely to result in the account being disabled; therefore, the machine sync will be unable to login and it will pause syncing but not delete everything that has been downloaded.

Having cloud backups is still really nice to have because while they do come with some new risks, they almost eliminate whole classes of errors like backup corruption.

One other important point is to avoid cloud services that cannot easily be replaced with some equivalent. You are far more likely to live longer than whatever random SaaS company you are using. In this case, you will probably have warning before it goes down, but you need to be able to migrate off of it (migration meaning no important data loss, not necessarily having a fully functional replacement) given a week's notice.