if you've gotten them all online or at least went online after having a preference in being offline, Yes you can keep all progress in achievements and saves. it's worth the upgrade as everything you've installed in the internal ssd will load faster, you can play previous xbox one titles (except the ones that aren't mark X/S, some games have a separate version between the series x/s and the Xbox one version.)
MewPewsy t1_j77oivw wrote
Reply to Should I upgrade by AshOnReddit1
if you've gotten them all online or at least went online after having a preference in being offline, Yes you can keep all progress in achievements and saves. it's worth the upgrade as everything you've installed in the internal ssd will load faster, you can play previous xbox one titles (except the ones that aren't mark X/S, some games have a separate version between the series x/s and the Xbox one version.)