UpdraftPlus backup error

0000.341 (0) Checking if we have a zip executable available
0000.343 (0) Testing: /usr/bin/zip
0000.364 (0) Output: zip warning: binziptest/test.zip not found or empty

This error was shown after an apparently successful backup. As well as three “large file” warnings.

When testing the site I found most of the image links had been erased. New server folders had been generated and all old material had been labeled in (same folder-old).

What can I do to prevent this error for a truly successful backup?

Thanks