Oomnitza allows you to export reports in .CSV or .XLSX. To export from Assets or any other Oomnitza module, navigate to the module, apply any search parameters or saved searches if you want to narrow down your export, then select "Export" in the upper right.
You can also export all objects from a given module by running an export with no filters applied.
You'll be prompted to select between .XLSX and .CSV. After you make a selection, Oomnitza will generate the export, then you'll be prompted to download it.
Additionally, all the history of a given object can be exported from the History Page of that object. Simply navigate to the history page for a given Object in Oomnitza and select the "XLS" icon in the upper right.