Back up your inventory collections items by exporting them in Excel file format.
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On both index pages, in every collection and the stocks, click on the (. . .) icon at the top right and choose 'Export' from the drop-down menu. This will generate an Excel file with all the information on each one of the items in that collection that will be sent to your e-mail. 

When exporting a collection that contains 'Sequence' field selected (plasmids, primers, sequences or any generic collection), you have now the option to export all sequences added to that collection in order to see multiple sequences that were added to a single item.
Click on 'Export Sequences' under the (. . .) icon:

For each item with multiple sequences, a new row with all the item-related fields filled will be added (like in regular export with stocks).