Upgrading from High Sierra to Big Sur but its stuck as the only tb drive was also used as bkp drive?
Where do I go from here to install Big Sur?
iMac Line (2012 and Later)
macOS Big Sur is compatible with these computers If the computer is listed - Yes Big Sur can be installed. If Not listed - it can not download and install Big Sur. The Profile in original question is showing iMac 2012 and later
If can not install Big Sur >>
The Age of this computer will Govern what newer version of macOS it will Qualify to install. Use About this Mac from the Apple Icon on Desktop - the required Information will be there.
With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. Make sure to use Only Safari to commence the download as Other may not work
Make a Time Machine Backup Before attempting. Notation - Mojave is the Last version to support 32 bit applications / extensions and Drivers. Catalina and Big Sur Only support 64 bit and there is no workaround.
Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation.
My machine is iMac Retina 5K, 27-inch, Late 2015 and is listed as compatible.
I did run backup TimeMachine backup but looks like a previous backup in June 2021 is stopping the only device listed being used stating - macOS Big Sur cannot be installed on "Macintosh HD"
Bit dubious killing this backup until I understand its my only option
Agree with previous posters assessment and for the reasons outlined in that posting.
Do I have a Rescue Plan In-Place. This comprises having 3 Backups using 2 methods and 1 Off Site incase of Theft, Loss or Natural Disasters. A Time Machine Backup is very useful and can be used to Revert to Previous Working macOS. For addition purposes - two Tested Bootable Clones each to separate external drives. This is insurance incase the upgrades goes sideways. At least one Tested Clone and / or Time Machine Backup should be Off - Site
You cannot install an OS on a disk that is being used for backups.
It i also not prudent to backup your mac on to the same disk you
are backing up data from.
The point of creating a backup is to safeguard your data should your macs internal drive fail.
If you are saving backups to your macs internal drive and the drive fails you will lose
all your data and the backups.
Always make backups to an external drive.
Upgrading from High Sierra to Big Sur but its stuck as the only tb drive was also used as bkp drive?
