A standard SMB share leverages caching to make things work fluently. Hiccups are hidden and go fast as caching often makes things look faster than they are under the hood. For the vast majority of knowledge worker application that support working against a file share, i.e. Word, Excel, PowerPoint and many other tools. For software that requires and is dependent on an absolute guarantee data is consistent and persisted at all times this is not enough. Backups to file share are one such use case. If the SMB Shares “lies” to the SMB client that all is written to storage but it is actually still cached things can go wrong. Most of the time, even with a small hiccup, things still go well, but that is not guaranteed. You might have an application think that all data is persisted without it ever having happening.
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