Not OP, but I have a small Nas at home, and a small raspberry with owncloud with the drives mapped. I run it all behind tailscale so all my devices have access to everything from anywhere. Backups are being migrated but I have my home pc as a backup while switching providers.
NAS at home, with a an old desktop machine working as local backup server. I have a cloud storage as secondary backup as mentionned earlier. Google drive/one would not be fit for that anyway as it is super expensive for very small amount of storage.