As part of the national programme Metamorfoze, restoration of this collection was started in 1998 so it could be committed to microfilm. This was an important step in the conservation of the songs, because the material is highly vulnerable in so many cases.

The original broadsides were restored if necessary; tears and folds were repaired. The most vulnerable sheets were then provided with protective Mellinex covers, and all the sheets were wrapped in non-acidic wrappers and stored in filing boxes.