Mac OS X cant repair disk backup

what does this indicate? I am new to mac

Mac OS X cant repair disk. Backup & reformat as soon as you can ..was the full message. Which has appeared a few times with a red exclamation mark.
Yesterday I plugged in my WD Ext H/D that I use for back up to my mac
(I dont understend partitioning...my son did that initially..my WD had "Storage" & "Backup"..but after I plugged the WD into my mac "Backup" didnt show up on desktop...I restarted backup using "Storage" thinking that was OK b ut then "Enter Time Machine" did'nt work ...
later that evening "You need to restart your Computor. Hold down the powerbutton for several seconds or press the Restart Button" then "Report this error to Apple"
At that point I closed down my mac & started fresh today...
totally confused...how did I loose my backups prior to the restart & can i get them back ????? what have I done wrong ?

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