It may be moot but I would argue that you should never store important data on another company's servers without some guarantee of service and contract of data

It may be moot but I would argue that you should never store important data on another company's servers without some guarantee of service and contract of data ownership. If the business was not profitable enough to afford Excel, OpenOffice is an almost Excel feature parity FOSS alternative. Had that file been stored on a cloud drive and regularly backed up to local or alternative 3rd party backup solutions, this issue not only wouldn't have happened but it also would not have been able to happen. Hindsight is 20/20. though. Don't store important documents on a cloud server that you have no backend access to without having a contract in place regarding the responsibilities of maintaining your data.