Prevent full sync after local recovery

I had to restore locally my directory from a stick ( Internet is to slow ) . Now the files have all the actual date.
Does onwcloud create complete new versions for all my all my 16.600 files ( 44GB) on the server or does it check if the file has changed ( like rsync) when syncing?
If it creates a new file, is there a way to prevent it, respectively can I tell owncloud to ignore all changes before a certain date?

I have the latest client for opensuse 15.2


Hi Andreas,

you might be interested in this documentation about restoring files:

Generally it’s a good idea to make yourself familiar with our docs.

Best Regards