To be fair, $600 for 64GB of RAM is a steal in this economy (you could probably sell the RAM alone for $800). So if you want that much RAM and are ok with the rest of the system - go for it. I mostly wanted to point out why I personally would not like such a machine (why I'm "sleeping" on it).
Mine was the equivalent of $660 at the time with 32GB of RAM (excl. HDDs). In this RAMpocalypse it would probably cost around $1k.

I would go a bit further than that. To me, not keeping archival backups for at least a few months seems grossly negligent. To a degree where they should be legally liable for the damages. They probably have some waivers for that in their terms... but they may not hold depending on the jurisdiction.