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See the user manual for further details.
- [doc/manual/src/user-callback.md](https://github.com/bit-team/backintime/blob/dev/doc/manual/src/user-callback.md)
- [backintime.readthedocs.io/en/latest/user-callback.html](https://backintime.readthedocs.io/en/latest/user-callback.html)
