If you find that significantly expanding the retention limit doesn't fit within the current pricing structure (as I expect it wouldn't given how competitively priced Backblaze is), consider offering it as an add-on feature, as Dropbox does with Extended Version History (+$40/yr for 1-year retention of deleted files).
Remote: Yes
Willing to relocate: No
Technologies: 10+ year gaming generalist focused on gameplay, systems, and UI using Unity, C#
Résumé/CV: https://www.blaqsmith.com/
Email: john at root url used for resume site