

Nope, I prefer being able to run my own network router, open/close my own ports, block ads on the network, hopefully get as much bandwidth as I can, etc. so it’s usually better for me to subscribe to my own internet.
… But since you bring it up, coincidentally I currently live on a street with shops/restaurants on the main floor under me. And all their wifi networks are visible from my apartment… so technically yeah, if I go through the trouble of collecting all their wifi passwords I could just hang out on their networks for free internet. Internet probably wouldn’t be great and not very private without a VPN but for free web browsing it should work.
All the loaded torrents in a torrent client already get stored somewhere in the torrent client’s own settings folders. e.g. if you look in qBittorrent’s settings folders you’ll find a folder full of .torrent files representing every single torrent currently in the torrent client.
So if it’s a torrent I’m going to leave loaded in the torrent client then no, there’s no reason to save a second copy of the .torrent file. But I guess if it’s a torrent I’m not going to load in the torrent client, or will remove it from there, then maybe it’s worth saving depending how you do things.
It would be better just to back up your entire torrent client settings folders, you’ll save all the .torrent files along with the save folders and other information you have in the torrent client.