Quite true, as I do myself, but “RAID is not a backup”. Use case here would be for offsite backup of encrypted, critical, low size documents (think docs, scans of important documents, source code, personal art) by aggregating e.g. 10Gb free accounts in such a way that if a provider goes tits up, or locks you out, you replace them as you would a dead drive in a RAID array. It’s mission critical secure backup for the poors…