Aside from legitimate DMCAs what I'm worried about is losing backupped files of any sort because some rogue individual files a complaint on stuff they don't own or because of an ML error and an inexistent customer service by Google. Also I don't really like the service to sneak onto any files I upload. What alternatives do we have for cloud file backup? I already do full backups, need something to sync files between…
I use an S3-comptaible hoster with the rclone client which supports encryption/decryption on the fly. That is, I don't even need to trust my S3 provider. For syncing between devices, I guess `rclone sync` should do the trick.
For example if you saved a folder of mp3 files using the rclone crypt functionality that you downloaded from a known BitTorrent, it would be easy for an adversary to match that set of known sized objects with high confidence at the storage provider end, or from observing encrypted network traffic (which in the S3 case leaks object size through traffic patterns) and deducing object sizes from there.