Deblending results in the form of HeavyFootprints should be available to users, which means they must be stored.
This proposal should include an estimate of how much storage this will require for a given area of sky, which can probably be derived from the average HeavyFootprint size in HSC data. This will be a function of depth, so it will not be the same at the beginning of the survey as it will be at the end (but we should have HSC data that spans those depths).
This will be a conservative estimate - it is possible that deblender outputs may take a form that allows them to be highly compressed and quickly reconstituted given coadd data.
We will not consider the possibility that it will be necessary to store per-epoch HeavyFootprints for ForcedSources.