I founded a solution based on that link, here complete tutorial
In terminal:
cd /tmp
wget --no-check-certificate https://slack.conraid.net/repository/slackware64-current/s3fs-fuse/s3fs-fuse-1.88-x86_64-1cf.txz
upgradepkg --install-new s3fs-fuse-1.88-x86_64-1cf.txz
echo AWS_ACCESS_KEY_ID:AWS_SECRET_ACCESS_KEY > ~/.passwd-s3fs
chmod 600 ~/.passwd-s3fs
mkdir /tmp/cache /s3mnt
chmod 777 /tmp/cache /s3mnt
s3fs -o use_cache=/tmp/cache mydbbackup /s3mnt
where mydbbackup is bucket name
I making tests if can share this shares inside Unraid, notify when have more informations.
1. Notification:
Add symbolic link to a disk1 this can show a s3-nas folder inside unraid folder struct can see and can download file.
In terminal:
ln -s /s3mnt/ /mnt/disk1/s3-nas