Trim History

How do I trim a files History?

By default, a SnapGene sequence file contains embedded copies of all of the ancestral files that have contributed to the sequence. The ancestral sequences can be viewed and restored via the History view. Extensive History trees can result in very large SnapGene files. Trim a files "History" to reduce the file size.

To batch-trim the history of multiple files with one step see - Batch Trim File Histories.

To set a limit on the size of any file History see - Set the Ancestor Limit for History Trees.

Open a File

Open a file with History information in SnapGene.

Switch to History View

Switch to History view to see all sequences and "edits" that contributed to the Sequence file.

Trim a Specific Branch

Click on an Operation label to select it (in this example "Change Methylation"), then click Edit History → Erase Selected Operation Plus Ancestors.

All ancestors on the branch preceding (below) the selected operation are removed.

Trim All History Branches to a Set  Level

In History view click  Edit History → Trim History Tree....

In the Dialog that opens use the dropdown to set the level for trimming, or click and type to enter the number of levels for trimming. Click Trim to Trim the History tree.

All branches are trimmed to the set level, in this example, the History is trimmed and shows the sequence and 1 level of Ancestral sequences.

Save the file to permanently trim the ancestral information.

If you make a mistake when trimming History you can undo via menu Edit → Undo