My system is warning me to back up my hdd can i know why?

IMHO, either akipp21 or Hawkeye22 may be correct. With more exact text of the message, we could tell why it is coming out.

If you have never used Windows Backup, a status monitor could be trying to get you to follow best practices and simply do a backup.

Alvine, what is that that you are holding? It looks like a large rack of ribs. A xylophone?