Post by Robert Peirce Post by nospam Post by Robert Peirce
I have backup drives, data drives, etc., all of which can be accessed by
the MBP as well as other computers, like my Mini. Do I need to convert
them? How do I do that and what happens if I don't?
no need and it's better if you don't.
I'm ok with no need but why is i better?
Some reasons to avoid APFS on external drives:
- APFS volumes won't be accessible if connected to a Mac booted into an
older major OS version.
- You cannot use APFS on Time Machine backup drives. They must continue
to use HFS+.
- The manual "Convert to APFS" feature in Disk Utility doesn't work on
The High Sierra installer can convert bootable drives to APFS (for the
target volume of the install), but only does that for drives it
recognises as an SSD, mostly limited to internal drives.
Working around that (e.g. by installing High Sierra to an APFS-formatted
hard drive) seems dubious if Apple isn't ready to use APFS on internal
- Third party low level disk utilities don't yet support APFS, and can't
until Apple publishes technical details.
As for "no need":
- High Sierra fully supports HFS+ so there is no reason to convert to
APFS "just because".
- Files can be copied between APFS and HFS+ volumes using Finder, or
opened and saved directly on either file system.
- Backup utilties like SD/CCC can create bootable backups of APFS
volumes on HFS+ volumes.
For general data storage on hard drives, the only reasons to prefer APFS
would be if you want to use features that are unique to APFS, e.g. a
wider Unicode character set in filenames, clones, free space sharing
between volumes in the same container.
Post by Robert Peirce Post by nospam
superduper does not yet support apfs.
I'm tracking SD!'s blog to stay on top of this. Since I have an SSD
drive and no choice on APFS, I am waiting to upgrade until I know it
Also look at the Carbon Copy Cloner blog for some useful information.