# Dirty bits

Dirty bits are status bytes associated with each item in
the D3 file system indicating that the item is new or changed.

These bytes are used to determine which items are backed
up during an incremental restore and are reset by a full file save.

## See also

- [file-save command](https://d3codex.com/tcl/file-save-command/)
- [save command](https://d3codex.com/tcl/save-command/)

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Source: https://d3codex.com/definitions/dirty-bits/ - part of the D3Codex reference.