gmail

Once or twice a day I'm getting the following error message: Gmail OAuth refresh token error. Please go to Notification for information on how to resolve this issue. I can reset my gmail by going to Notifications, waiting a minute or so then re-entering my gmail email address, signing out then...

Hi, I have free 15GB version of Google services. Only mails there and reaching 90% usage. Is it somehow possible to move old mail to any Synology app and do such archiving regularly? I can still use Gmail for recent mail and daily mails. Would appreciate any hints :)