Two serious issues have been identified in 1.43.3 release candidate 5 and 6 that may prevent certain files from being included in your backup. These bugs are not present in the final release of 1.43.3.
If you are currently using the latest release, version 1.43.3, then you may safely ignore this message. If you are using a 1.43.3 release candidate, it is strongly recommended you update to 1.43.3 as soon as possible.