Would strongly recommend with offline editing such as with JOSM and reusing downloaded datasets (finish today or last week, new edits tomorrow), to run a “update data” or equivalent, before continuing the next day as other mappers could have changed something you downloaded the day/week before. If you don’t, you could end up with a ‘conflict’ situation when uploading your new edits, where your edit(s) differs from what was downloaded before from the server. Than you have to determine whether what’s on the server prevails or your new change does which then results in effectively dismissing the edits of same objects of the previous mapper. Not nice at all.
