Backblaze has stopped backing up OneDrive and Dropbox folders and maybe others

It's that to back up a folder on a filesystem, you need to traverse that folder and check every file in that folder to see if it's changed. Most filesystem tools usually assume a fairly low file count for these operations.

Git, rather unusually, tends to produce a lot of files in regular use; before packing, every commit/object/branch is simply stored as a file on the filesystem (branches only as pointers). Packing fixes that by compressing commit and object files together, but it's not done by default (only after an initial clone or when the garbage collector runs). Iterating over a .git folder can take a lot of time in a place that's typically not very well optimized (since most "normal" people don't have thousands of tiny files in their folders that contain sprawled out application state.)

The correct solution here is either for git to change, or for Backblaze to implement better iteration logic (which will probably require special handling for git..., so it'd be more "correct" to fix up git, since Backblaze's tools aren't the only ones with this problem.)

Not backing up .git folders however is completely unacceptable.

I have hundreds of small projects where I use git track of history locally with no remote at all. The intention is never to push it anywhere. I don't like to say these sorts of things, and I don't say it lightly when I say someone should be fired over this decision.

My understanding is that a modern, default onedrive setup will push all your onedrive folder contents to the cloud, but will not do the same in reverse -- it's totally possible to have files in your cloud onedrive, visible in your onedrive folder, but that do not exist locally. If you want to access such a file, it typically gets downloaded from onedrive for you to use.

If that's the case, what is Backblaze or another provider to do? Constantly download your onedrive files (that might have been modified on another device) and upload them to backblaze? Or just sync files that actually exist locally? That latter option certainly would not please a consumer, who would expect the files they can 'see' just get magically backed up.

It's a tricky situation and I'm not saying Backblaze handled it well here, but the whole transparent cloud storage situation thing is a bit of a mess for lots of people. If Dropbox works the same way (no guaranteed local file for something you can see), that's the same ugly situation.

Doing a bait-and-switch on a percentage of your paying customers, no matter how small the percentage is, may be "viable" for the company, but it's a hostile experience for those users, and companies deserve to be called out for it.