normally this folder are synced to dropbox and/or onedrive

both services have internal backups to reduce the chance they lose data

both services allow some limited form of "going back to older version" (like the article states itself).

Just because the article says "sync is not backup" doesn't mean that is true, I mean it literally is backup by definition as it: makes a copy in another location and even has versioning.

It's just not _good enough_ backup for their standards. Maybe even standards of most people on HN, but out there many people are happy with way worse backups, especially wrt. versioning for a lot of (mostly static) media the only reason you need version rollback is in case of a corrupted version being backed up. And a lot of people mostly backup personal photos/videos and important documents, all static by nature.

Through

1. it doesn't really fulfill the 3-2-1 rules it's only 2-1-1 places (local, one backup on ms/drop box cloud, one offsite). Before when it was also backed up to backblaze it was 3-2-1 (kinda). So them silently stopping still is a huge issue.

2. newer versions of the 3-2-1 rule also say treat 2 not just as 2 backups, but also 2 "vendors/access accounts" with the one-drive folder pretty much being onedrive controlled this is 1 vendor across local and all backups. Which is risky.