Warning Messages during Full Backup

Hello,

I ran a full backup of a website and got the following error message for many different files:

WARNING: File name “wp-content/uploads/2013/09/Washington-Post-The-world’s-leading-development-economists-can’t-agree-on-how-to-tackle-inequality.pdf” is too long to be saved correctly in TarBz2 archive!

How do I resolve this issue? Any feedback would be much appreciated!

– Carlos