I getting the this error when to try backup the wp-content/upload folder.
I'am uising the pclzip setting. With zip settings no error. This is only with the upload folder.
ERROR: PcLZIP file:media/2016/05 add failed -10: gzip temporary file '/home/mardui/domains/marielleduijndam.com/public_html/wp-content/uploads/snapshots/_backup/1468322165/pclzip-5784dc88be927.gz' has invalid filesize - should be minimum 18 bytes [code -10]