Akeeba Backup 3.1.5 fixes all known bugs in the 3.1.x branch. Most notably, the last release contained two high priority bugs which went unnoticed during our regular testing. The ZIP archiver was producing broken ZIP archives and the integrated update feature was non-functional. All users are suggested to upgrade to Akeeba Backup 3.1.5. All previous versions (including 3.0.x and 3.1 through 3.1.4) are now considered obsolete and will not be supported.