iCal backup files (.icbu) contains backup of calendar data, including contacts or saved events. Which means that it likely possible that there exists a way to how you can extract the contents of .icbu. Such icbu to vcs conversion might be achieved either by recovering the backup, or by using some kind of conversion utility.
Home > Search converters: icbu to vcs
Conversion of icbu file format to vcs file format beta
Search for icbu to vcs converter or software able to handle these file types.
Convert Apple iCal backup to vCalendar event.
We have found one software suitable in our database for this conversion.
Apple macOS / Mac OS X software 
- convert icbu to vcs 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 icbu file | No | Yes | No | No | Yes | Yes | Yes | No |
to vcs file | No | No | No | No | No | 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 icbu file, Open vcs file
ICBU
Files with icbu file extension can be found as calendar data backups made in Apple iCal/Calendar program.
VCS
Files with vcs extension are in most cases related to the vCalendar file format used by Microsoft Outlook and other calendar management applications for various platforms.
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