Hey Sharee,
I want to be honest with you here: retroactive sync is a request we've logged and that a lot of customers have asked for, but it isn't currently scheduled or in development. I don't have a timeline or details on what it would look like if we develop it.
But here's the part I'm confident about: connect now anyway. Every day you're not connected is another day of projects joining the "needs manual work" pile. Connect today and that pile stops growing — everything from here forward handles itself. If a retro sync does ship later, you'd be in the best possible position for it. And if it doesn't, you've still got the manual download-and-upload path for the older stuff, and a much smaller backlog to chew through.
I'll keep your request attached to the internal ticket either way. Thanks!