The Offline Circulation tool can be used should your library lose Internet access. Learn more about the tool here: http://kylehall.info/index.php/projects/koha-tools/koha-offline-circulation/
Once you regain access to your Koha database you can upload the data you collected in the Offline tool.
Once a file has been uploaded the data remains in the file. The library may want to keep a copy of the file in another directory, or change the file extension frm .koc to .txt. The utility only looks at files with a .koc extenison. If this isn't done, staff may accidentally add new data to an old file.