You can't predict when Fusion 360's cloud services will go offline. Here's a quick video on how to Backup and Cache Fusion 360 projects.
Project Archiver
A great way to backup your Fusion 360 files is the free add-in, Project Archiver.
Backblaze
While we’re talking about backups, just go ahead and get your computers setup with unlimited backups from Backblaze - it’s what we use and I highly recommend it!
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