Issue Summary

Calendar backup file sent via email after deletion is exported as gzip instead of ics, causing import failure.

Steps to Reproduce

1. Go to a Confluence Cloud space and navigate to the Calendars section.
2. Delete an existing calendar.
3. Check the automated email sent to the user containing the calendar backup.
4. Download the attached backup file.
5. Attempt to import this backup file back into Confluence Calendars via "Import calendar".

Expected Results

The backup file should be in .ics format, and it should be successfully imported into Confluence.

Actual Results

The backup file is exported as a gzip file (or an ics file that is actually gzipped). When attempting to import it, the process fails with the following error message:

"The uploaded data does not seem to be iCalendar content."

Workaround

Manually decompress the gzip file to extract the original .ics file before attempting the import. If the file extension is .ics but it is still recognized as a gzip archive, rename the extension to .ics.gz, extract it, and then use the resulting .ics file.