HWTech wrote:
Are you backing up the external boot drive while booted to the internal SSD? If so, then that is the problem because of how the "Macintosh HD" volume is constructed ever since macOS 10.15 Catalina.
It's an M1 chip on a 10,1 Air. (I apologize for not having my signature list this.) The OS is Monterey 12.6.8.
If you want to remove a backup you either need to remove the volume(s)
from the TM backup or erase the TM backup drive & start fresh (or
You cannot manually modify or delete items from the TM backup drive
because it is now on a read-only volume. If you want to remove a backup
you either need to remove the volume(s) from the TM backup or erase the
TM backup drive & start fresh (or use another drive if you wish to
keep the existing backup).
HWTech continues:
If you want to remove a backup you either need to remove the volume(s)
from the TM backup or erase the TM backup drive & start fresh (or
You cannot manually modify or delete items from the TM backup drive
because it is now on a read-only volume. If you want to remove a backup
you either need to remove the volume(s) from the TM backup or erase the
TM backup drive & start fresh (or use another drive if you wish to
keep the existing backup).
It doesn't look like either of these are a possibility. TM Preferences only give me: the choice of storage device to use for the TM back-up ("Select Disc"), OR which discs to not be backed up ("Options"). For Select Disc, Po'Sport is already chosen but appears a 2d time as a possible additional disc for TM use. For Options, Po'Sport is the only offered to deselect from back-ups.
or erase the TM backup drive & start fresh (or use another drive if you wish to
keep the existing backup).
Starting again fresh would seem to be only option available. The downside would be that the laptop's back-up (which is working properly) would also be trash .
I hope these details are useful. I'm grateful for your helpfulness.
