Hello all,

I have a nas from qnap to make time-machine backups and mostly it works fine
But Since I use this nas for Time-machine since january 2015, it’s the second 
time, now and one tim 
e in july, that all backups from the past are deleted.

I receive the followingg message:
:application alert system dialog Time Machine completed a verification of your 
backups on “BackupSchijf(TimeMachine)”. To improve reliability, Time Machine 
must create a new backup for you. Click Start New Backup to create a new 
backup. This will remove your existing backup history. This could take several 
hours.”

I found no specific reason of this problem on the internet and also, the 
macbook of my wife is also connected to the nas for time-machine and she makes 
backups since january without any problem.

My macbook is running 10.11.1 and my wife runs 10.10.5.
But, since my problem was also there in july , with 10.10.5 I think, it doesn’t 
matter which version of osx is installed.

All idea’s are very welcome.

Kind regards,
William Windels

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