@aaronwong - There is no OOTB functionality for this, however, we have a tool to help for the same. Please let me know and I can share the details over the PM.
If you are or have a developer in your team you can try building a simple version of an archiving tool. Our developer has shared some of the steps here. We've built our own simple tool, it does the job but can't process too large batches though.
https://community.lithium.com/t5/Strategy/Archiving-Posts/td-p/208604/page/3
Good luck.
Wendy
Learning from others and helping where I can!
Community Passionista!
Community Passionista!
