On SharePoint Online, I've got this list which just recently went over 5000 items. We have indexed columns and filtered list views in place in preparation for this, but it's still not enough and is breaking custom script components on our site.
We figured that for the time being, we would place older items on an archive list with a similar structure to the original list.
Is this a sound plan? How would we go about doing this?
I've tried saving the list as a list template but it won't let me since I have the threshold limit exceeded. Is there any way around this besides manually creating this custom list? How would the items be moved as well without them losing their IDs?