If you copy a database and access it at one time it breaks
Only Windows 10:
When you save your changes and a data recovery service copy your edited files at the same time, they could break.
Mark Burns commented
My experience with this has been that "background copy" apps either grab an exclusive lock on the database file before they can copy it, or they fail and don't start a copy (this simultaneously prevents the database file from being opened or from "saving changes" to form/report/code/macro objects by way of existing file sharing mechanics). If you have a background/shallow-copy app or service that does not do things this way (or is mal-configured), then it is the flaw of that app and its developers or administrators in your enterprise...not the fault of MS-Access or the ACE engine.