In light of today's events (see post here), I believe it would be beneficial to allow users to locally store all Fusion files and data. The data can still be backed up to the server, but is locally stored first. This would prevent server outages from becoming catastrophic events for businesses, schools, and individuals. If users did not want to locally store files (due to disk space or other reasons), they could elect not to in Fusion's preferences. Or perhaps this could be a setting for each folder or project.
Manually, individually backing up files (a current Fusion capability) is not a reasonable solution to this problem. Not only is it time-consuming and difficult to manage well, it does not currently work for designs that have XREFs.
I personally have no problem using the cloud for storage and computing (such as simulations). There are some great things that Fusion allows because of this capability. The lack of local storage as a backup, however, is an issue for me.