Both time machine drive and startup disk can't be repaired by disk utilities and needs to be formatted!!??

ok so i accidentally remove the USB while my laptop was backing up to the time machine partition on my external HDD. I plug it in again, and no time machine partition. just the other part (fat 32 partition). so i open disk utilities.. the partition is there but grayed out. so I repair it.. and it says it cant repair it i need to back it up and format it. ok great.. i tried to do that and it said it can't access the disk.. super.
any way.. i don't know  why i decided to check my other drives and see how they're doing.. and it turns out.. my startup disk has problems.. and you guessed it.. it can not be repaired:D so i restart in recovery mode.. did it again.. and?  it can't be repaired.. i need to backup the drive and format it... (like the same problem with the time machine partition) just great! so i restart the laptop.. it safe boots.. I dnno why.. and everything is like it was.. I mean I don't see a problem with my drive.. i can do everything but that "cant repair" thing is scaring me.. what should I do? just leave it? or brace myself for a possible HDD death? I DON'T EVEN HAVE A BACKUP)
help me i feel vulnerable

As you have indicated, you don’t want to touch the partitions on your existing external drive because it has live files in the FAT32 partition for which there are no copies anywhere else.  That leaves you with two sets of data that are currently not backed up: your FAT32 partition and your system drive.  I suggest you need at least one more external HD for backups.
A “backup” drive should never have live files on it because should that drive fail all the live files on it would be lost.  So you need a second external HD anyway for a proper backup scheme.
I would partition a new disk as you have the current one and then copy all the FAT32 files form the old disk to the new one.  Then you can try repartitioning the old drive.  I would then setup a backup scheme to periodically clone the new FAT32 drive onto the old FAT32 one, using the new disk for your live FAT32 files and dedicating the old disk to backups.  You could also continue using the old disk for Time Machine backups.
You can use Mac cloning software such as Carbon Copy Cloner to maintain the cloned backup copy of your FAT32 data.
http://help.bombich.com/kb/usage-scenarios/backing-up-tofrom-network-volumes-and -other-non-hfs-volumes

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