So again, no lost data other than some unsaved work it sounds like. Icloud, Amazon S3, Dropbox, Google Drive, OneDrive ALL offer massive redundancy and differential backups for cases just like this. It's why nobody loses data. I know people generally don't trust the cloud but I follow the evidence and I have never seen evidence of cloud data loss.
Regardless, having only one copy of important work files is foolish. When your job or company depends on that data, you keep several copies around even if it's 99.99% safe because it's a business asset. Even that 0.01% is worth replicating it elsewhere. Like LeeW, I have a NAS replicating my Dropbox folder even though I have never used it and I never expect to.