When you backup calendar data (.ics) in Apple Calendar (iCal), an .icbu file will be created that stores the backup. This is probably the only way how to achieve this ics to icbu conversion, although it's more of a standard backup process than conversion.
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Conversion of ics file format to icbu file format beta
Search for ics to icbu converter or software able to handle these file types.
Convert iCalendar calendar file format (Microsoft Outlook, Apple iCal) to Apple iCal backup.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software 
- convert ics to icbu on OS X
Apple Calendar (iCal)
Apple's personal calendar application for Mac OS X
File extension | Convert | Open | Save | Edit | Create | Import | Export | Extract |
|---|---|---|---|---|---|---|---|---|
Convert from ics file | No | Yes | No | No | Yes | Yes | Yes | No |
to icbu file | No | Yes | No | No | Yes | Yes | Yes | No |
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.
Additional links: Open ics file, Open icbu file
ICS
Files with ics extension are calendar data in exchange format which is widely accepted in many personal information managers and e-mail clients such as Microsoft Outlook, or Apple iCal. It is an universal format for transporting calendar data and events from one program to another.
ICBU
Files with icbu file extension can be found as calendar data backups made in Apple iCal/Calendar program.
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