To format the drive in Windows, right-click it in the File Explorer window and select “Format.” Choose the “exFAT” file system in the list and click “Start.” Remember, this will erase all the files on the drive! In case you have HDD then the format should be HFS+ Here comes the. Jorge Ledezma, Mac User since 1984, OSX developer since 2011. The most common format for a Time Machine backup disk is Mac OS Extended (Journaled) format. Time Machine Question - from total Mac NEWB: I've completed by first Time Machine backup (to Time Capsule). Next I want to INCLUDE an external USB 3.0 drive to the backup set. This drive is used for archival storage for my Windows Virtual Machine's data files (work stuff, sharing w/PC Laptop). I have this disk formatted as exFat, so no problems reading from Win or Mac. Complication: Apparently Time Machine does not support exFat formatted drives. I can see the external drive from Time Machine Preferences, but I cannot select it. What format should I use to simultaneously support: Mac, Win, Time Machine?? Thanks Kappy, Let me clarify a bit. I am migrating from a PC Laptop to a MacBookPro (retina). The files on the external drive do not need to reside on the MacBook, especially considering limited SSD storage capacity. I may need to access these archived client files occasionally from the external drive. I wish to include this archive information in my Time Machine backup regimen, as I cannot trust the external drive to be my sole copy of this critical information. As my clients progress, I may add more data from the SSD to the external drive, so the set is not static. A secondary requirement is to permit me to share data with my clients (to and from), so a Win-compatible disk is very helpful (though USB thumbdrive might suffice). So, not backing up from Windows.PC here at all. Just backing up a Win-readabe storage device. Hope that helps, Mark. Shootist.and this is exactly my issue. In order for my clients to share data when I am on-site with them is for this external drive to be formtted as FAT32 or exFAT. From what I am learning so far, neither of these formats can be backed-up using Time Machine. I agree, a Word Doc is a Word Doc, unless I am trying to deliver directly to my client. Word docs not a great example, but HUGE databases are the concern. Email is just not a viable option. Connectiong the drive via USB is the intended use model. Am I seeing this correctly? Kappy he also has an External USB drive. QUOTE: Next I want to INCLUDE an external USB 3.0 drive to the backup set. This drive is used for archival storage for my Windows Virtual Machine's data files (work stuff, sharing w/PC Laptop). I have this disk formatted as exFat, so no problems reading from Win or Mac. END QUOTE: But after I reRead his post I see his problem. He is trying to include that USB drive formatted exFAT to the Mac TM backup. It is saying it doesn't support exFAT drives because it may not be able to write that format when doing a restore. Lock worksheet but unlock certain cells excel for mac. Bad Idea to included any external drive to a TM backup system. TM is more for internal drives so if you have a drive failure you can replace the drive and then use the TM backup to restore your system the the last time you may a backup. If you include an external and that external is not connected to the system when doing a restore the restore will fail. You are better off buying a second external and copying the data from the Mac Win external to that other drive. IE having a second copy of all that data. Basically the same thing would happen if you tried to use a Windows Backup system to include that external drive.
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