Incremental SEPM/GUP updates for 60 days needed at low bandwidth branches

I've got a client whose remote workers at some branches connect every 45-60 days. The branches have low available bandwidth, and the workers connect only for short amounts of time when they visit their branches - often not long enough for a full 200mb update. The SEPM server currently would have to hold 80 gigabytes of content (1 set per day * 32bit and 64bit definitions) in order to provide delta updates for that time period. Is there a way to increase the GUP paramenters to retaining 60 days of deltas while running the SEPM content at 30 days, or some other way of avoiding such a huge storage requirement on the SEPM server?