Data copied from devices during advanced searches at entry points into the U.S. gets saved for 15 years in a database searchable by thousands of CBP employees without a warrant.
There is very little to reason to believe that any data copied by agencies like this is deleted ever. You should assume any data copied like this is kept forever, shared between agencies and corporate contractors, compiled into various databases and lists, used to train shady security contractor AI systems.
There are no comprehensive federal data privacy laws in the United States, and even if we get one in the future, it probably won't apply to security agencies.
Honestly I hate all these file sharing self hosting things. Looking at you nextcloud owncloud syncthing seafile etc. They all suck. All I want is NFS support in android, that's my only pain point accessing my files from anywhere from my home network. I can already VPN/wireguard into my network from anywhere, but I can't grab an ebook or mp3s off my NFS server from my phone or tablet, I have to have some other dumb infrastructure for it. Just (#@$^* put NFS in android already!!!
/endrant