Backup appears to be taken correctly, has correct size on backup server but shows incorrect or zero size in the UI
All versions of OnApp
This is most commonly caused because backups are being stored on NFS partition with cache enabled. disabling cache should allow proper size to be shown in the UI when backup is made.
For existing backups, it would be needed to update the size in the database for the given backup - this can be done manually, using the backup id # as index for backups table (backups.id field)