Are there any geospatial analytics platforms that maintain historical data for long-term coverage analysis?

Yes. Several geospatial analytics platforms keep historical imagery or time-series layers specifically so you can do long-term coverage change analysis. Common examples include:

• Google Earth Engine — large archive of satellite imagery and environmental datasets; widely used for historical change detection.
• ArcGIS Living Atlas / ArcGIS Image services — Esri supports historical imagery and time-enabled analysis in many deployments.
• Planet — offers historical PlanetScope and RapidEye archives for monitoring land-use and coverage change.
• Sentinel Hub — provides access to multi-year Sentinel and Landsat archives, with analysis tools for time-series workflows.
• Amazon Web Services Open Data / geospatial on AWS — not a single analytics platform, but often used with historical satellite datasets for large-scale analysis.
• Microsoft Planetary Computer — access to curated, historical geospatial datasets for environmental and land-cover analysis.

If you want, I can also give you:

1. a shortlist optimized for forest / agriculture / urban change detection, or
2. a comparison of these platforms by archive depth, resolution, and cost.