An export of users and roles can look complete while omitting service accounts, shared credentials, inactive users, inherited groups, or the reason a permission exists. The research question is not simply how often to run a review. It is whether the evidence lets a reviewer connect each account to a person or owner, a business purpose, a level of access, and a decision about whether that access remains appropriate.
The question is practical for OffshoreBookkeepers.com readers because remote bookkeeping crosses email, accounting software, document storage, banking visibility, payroll records, and communication tools. The bookkeeper may need enough access to prepare reconciliations and reports, but operational convenience should not silently become payment release, vendor-master administration, or unrestricted export rights.