Enterprise 1 V9.1 Batch Next numbers rollover

My company is currently at 98,260,000 on our batch next number. We will use the remaining 1,700,000 number in the next 3 to 4 months. We have a concern about the rollback to 1 of this number and what will happen to performance on inserts as well as duplicate numbers to what we have archived. We have been archiving since 2008 and a large number of our batch headers have been deleted by running the R007031 report. When the number resets to 1 the system will assign a new batch 1. When we attempt to archive this will be a duplicate to a batch in the archive. Does anyone have experience with this issue.