From
Technology Standards:
4.8.4 The use of cloud-based services for storing and/or backing up MLS or any membership-related data is prohibited.
I guess that leaves open allowing administrative non-membership related documents to be backed up that way.
Note that the church only backs up the data in MLS. All the other documents, like sacrament meeting programs and other internally generated documents are the responsibility of the local unit to back up.
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