Right, but even if that’s working it breaks the user experience of services like this that ‘files I used recently are on my device’.
After a backup, you’d go out to a coffee shop or on a plane only to find that the files in the synced folder you used yesterday, and expected to still be there, were not - but photos from ten years ago were available!
That shouldn't be seen as Backblaze's problem. It's Dropbox's problem that they made their product too complicated for users to reason about. The original Dropbox concept was "a folder that syncs" and there would be nothing problematic about Backblaze or anything else trying to back it up like any other folder.
Today's Dropbox is a network file system with inscrutable cache behavior that seeks to hide from the users the information about which files are actually present. That makes it impossible for normal users to correctly reason about its behavior, to have correct expectations for what will be available offline or what the side effects of opening a file will be, and Backblaze is stuck trying to cope with a situation where there is no right answer.
There’s no reason to think that would happen - files you had from ten years ago would have been backed up ten years ago and would be skipped over today.
Good point (I’m assuming you’re right here and it trusts file metadata and doesn’t read files it’s already backed up?)
It would still happen with the first backup - or first connection of the cloud drive - though, which isn’t a great post-setup new user experience. It probably drove complaints and cancellations.
I feel like I’ve accidentally started defending the concept of not backing up these folders, which I didn’t really intend to. I’d also want these backed up. I’m just thinking out loud about the reasons the decision was made.
After a backup, you’d go out to a coffee shop or on a plane only to find that the files in the synced folder you used yesterday, and expected to still be there, were not - but photos from ten years ago were available!