Methods, apparatus, and computer program products for selectively backing up versions of files to a robust storage medium according to file version differences

摘要

Files on a computer are selectively backed up to an external storage medium included in an uninterruptible power supply (UPS). At least one of a time difference, a file size difference and/or a file content difference between a first version of a file stored on the external storage medium and a second version of the file resident at the computer is determined. The second version of the file is stored on the external storage medium based on whether the determined at least one of a file time difference, a file size difference and/or a file content difference meets a predetermined criterion. For example, the predetermined criterion may be a degree of difference criterion, e.g., a threshold amount by which the file date, files size and/or file content of the first and second versions must differ before the second version is backed up. The invention may be embodied as methods, apparatus and computer program products.