I have lost Time Machine backups after latest backup something to do with security error or authentication. now it only goes back to march 2016 ,previously it went back to 2012. It is the same on both backup disc, one locally attached and the other is a time capsule via wifi
Do you remember seeing a message that looks like this back in March?
Thanks Bob this is exactly what i got a couple of days ago. And I followed Start new backup which took most of the day
Unfortunately, this message appears when Time Machine detects that your backups have become corrupted. When this occurs, Time Machine will erase your existing backups and start over again with a new "master" backup. So, if you saw this message a couple of days ago, your current backups will only be over the last few days.
Unfortunately again, Apple does not know why the corruption issues occur, so there is no assurance that the message may appear again at any time in the future. The problem is much more likely to occur with backups on a Time Capsule than it is on a USB hard drive that is connected directly to a Mac.
For that reason, I would suggest that you adopt a dual back up strategy with backups going to both the Time Capsule and the USB hard drive.
There is more information about this perplexing issue in the link below. It is difficult to say how many users have been affected by these corruption issues, but whatever that percentage might be, it is far too high.
Bob thanks again, I do have one drive connected by USB and the other via wifi but both discs are now in the same state does the corruption normally affect both discs ?
graham F wrote:
I have lost Time Machine backups after latest backup something to do with security error or authentication. now it only goes back to march 2016 ,previously it went back to 2012. It is the same on both backup disc, one locally attached and the other is a time capsule via wifi
I didn't get the message - but my time machine was corrupted last November & could not go back past that day although I could see the sub folders in time machine.
The problem appears to have happened when My Time Machine drive was a tad over 50% full (mine also went back to 2012)
In the end had to turn off time machine backups - and erase the drive. I partitioned the time machine drive and restarted time machine in one partition. At some point will stop backing up to that partition and move to the other one.
It may have something to do with Spotlight/Finder indexing -- as I don't use that search anyway - I put all my drives in the private area.
It may be that Time Machine can get too strung out to keep its pointers correct for time periods.
No, it does not. I now suspect that the Time Machine software itself on your Mac is having problems, and since Time Machine is unfortunately part of the Mac operating system, the only potential solution would be to wipe your Mac and reinstall the operating system.
I suggest that you post in the support forum for the operating system that is currently installed on your Mac for advice from the operating system experts. Click on the link below, then select the operating system that you are using on your Mac. Good luck!
I have just posted it on the el captain forum thanks for your help Bob
time machine backs now only 3 months old?
