# Backends

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This page covers more advanced FMTC usage, and is not appropriate for beginners or simple use cases.

TLDR; FMTC provides a single storage mechanism by default, named `FMTCObjectBoxBackend`.
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FMTC supports attachment of any custom storage mechanism, through an `FMTCBackend`. This allows users to pick their favourite database engine, or conduct in-memory testing.

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Only one backend is built-into FMTC: the `FMTCObjectBoxBackend`. This backend uses the [ObjectBox library](https://pub.dev/packages/objectbox) to store data.
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> More info coming soon...