I have 2 WD external HD for back up. One is hooked up to the Time Machine and the other is used to store all my large photo files. The time machine excludes the second one. I need to back this up as well . How do I reformat it so it will ?

I just purchased 2 WD TB external hard drives. I have one formatted to be used with the time machine and it is working well. the other that i am using to store large files is excluded from the time machine. I can't click on it and add as per instructions. It won't allow me to. I need to back t his up as well. Ive backed up this one so I am able to reformat it but it doesn't recognize the drive unless it is formatted in FAT which is what WD advices it be formatted in. It should be in Mac extended journaling but I can't get it to mount in that. Help?

In addition, TM will not backup drives partitioned in FAT as the OP stated his 2nd EHD is formatted. My recommendation to the OP is to reformat the 2nd EHD to Mac OS Extended  (Journaled) and then include it in his TM backups. Of course in order to do this the OP must first move the data on the FAT partitioned drive to his internal HD and then once the EHD is re-partitioned correctly he can move it back.
In addition as Pondini mentioned the 2nd EHD must be directly connected to the iMac rather than be a network drive, TM is NOT, repeat NOT a network backup solution with the single caveat of using a Time Capsule backup.

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