'TimeMAchine not able to restore data

I am working with Big Sur and my TM volume resides on a synology NAS. It backs up at least evers hour, sometimes every 30 minutes. But trying to restore a file or folder from a week or a month ago does not allays work. Using the arrows beside the window chooses a date a month or two behind. Choosing a date on the timeline at right flows to the date, but the TM remains in 'loading', even an hour or more and does not find the data. Only for some - few - dates the data is found. I tried restarting the machine several times with no success. Any ideas about that?



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