I ... had a 128GB Lexar Flash Drive ... and found the ... drive formatted ExFAT with a Master Boot Record partition table could NOT be removed from the Time Machine exclusion list.
I’ve got a couple of inexpensive
4T USB-3 Seagate hard drives. They come NTSF-formatted (MBR partition table) with an NTFS driver for Mac OS X, and are listed as ‘fully compatible’ with Time Machine. I wasn’t planning to use them with that format & driver for TM, but now I am wondering how these would play with the TM exclusion list. Any idea?