Start with minio 🙂
emmmm self-built storage does not take into account 😅 But if the amount is high, it will still be considered.
I'm using Google Drive but if AWS = S3 compatible then S3 could be any bucket provider like Amazon or DigitalOcean.
Google Drive PLEASE
Google drive would be best. Cpanel has good support for Gdrive
Google Drive is free
Yes Google drive
Yes Google Drive Good For Backup