Hi @Stig Unhammer ,
According to my research and testing, there is currently no direct way to achieve your needs, OneDrive cannot perform sync based on time.
For the first point, there is a workaround for your reference:
Put all files older than 2 years in a folder and uncheck it when syncing.
For the second point, if the file has not been modified, it will not be synced again.
Thanks,
Yanli Jiang
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