| Apple Address Book Archive Format | |
| N/A | |
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ABBU is a database file copy that contains addresses used by Contacts app available for Mac OS X and macOS. ABBU file stores all Apple address book information.
iCloud automatic data synchronization feature ultimately deemed manual creation backup copies obsolete. ABBU file can be created using Contacts ‘Contacts Archive’ option selected from ‘Export’ submenu of ‘File’ menu. Size of created archive depends on whether contact data also provides photos or not.
| .ab | Google Android Debug Bridge Backup Format |
| .aba | Palm Address Book Archive Format |
| .abbu | Apple Address Book Archive Format |
| .abf | Adobe Binary Screen Font Format |
| .abk | Ability Write Backup Format |
| .acp | Alfresco Exported Repository Format |
| .adi | Active@ Disk Image Format |
| .aea | Ae Timer Alarm Document Format |
