I wouldn't replace the drive just yet, but I would have backups... even if it wasn't clicking. If it's important enough for you not to lose, you should always have backups.
ALL HARD DRIVES FAIL EVENTUALLY. MAKE BACKUPS!
The number one question asked in the storage section is "how do I get my files back?" It amazes me that these people never backup their data then cry when it's gone.
Thank you Hawkeye ....Will backup my external for sure.
Appreciate your concern and time