Photo's Back up
If my System's Photo's library is on an external hard drive, will Time Machine still back my photos? -Dave
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Yes. Time Machine should backup your boot drive and all mounted EHDs. You can check to make sure the EHD is being backed up by opening the TM drive and looking inside one of the backup folders. You'll see something like this:
This shows my boot drive and two external HDs. The others are system/TM items to be ignored.