suspending backup after restore

Hello

I have a daily plans for my files-backups. After a crash of the source I restored the content to another NAS.
Now I want to suspend the old backupplans without deleting them.

I wanted to change them to "no plan", but I can't save them, the button save is greyed out.
Whats going wrong? The old NAS (source) is gone.

Please give me a hint or a solution to stop the plans, without affecting existing backup-data.

Thanks in advance
Piet

Acronis true image 2014 premium (german version); BUILD: 6673