With a public company like Verizon or AT&T? No.
Maaaybe the Secret Service has a technical infrastructure team responsible for that (and if so, they likely also wiped that).
Outside of that, I don't why its hard to grasp that it's not in the government's best interest for a third party to backup the cellphone data of the people protecting the most important man in the world? Are you unaware of what can be deduced through cellphone data alone? You are insinuating the equivalent of the government backing up their data via DropBox.
Why is it that much of a stretch to assume that the technology around protecting the president is different from what is stocked at Walmart. The way the FBI retrieved money from the Colonial Pipeline ransomware attack is still bordering on magic to the point that the public just defaulted to Occam's Razor. Stingray's are another example of something that seemed impossible until the courts got involved and showed just how deep the rabbit hole went.
Dude what you don’t grasp is the government owns any and all communications on their devices… it’s not about a company back dropping.. it’s apart of the national archives.. all gov communications are saved in some form or fashion..