s3fs

Install

sudo apt install -y s3fs

Create credentials

echo ACCESS_KEY_ID:SECRET_ACCESS_KEY > ~/.passwd-s3fs
chmod 600 ~/.passwd-s3fs

Mount s3 bucket

s3fs backups /media/backup \
  -o url=https://s3.example.com \
  -o passwd_file=~/.passwd-s3fs

Parameter

-o url=https://s3.example.com,allow_other,umask=0000
-o use_cache=/tmp/cache

/etc/fstab

mybucket1.mydomain.org /mnt/mybucket1 fuse.s3fs _netdev,allow_other,passwd_file=/home/ftpuser/.passwd-aws-s3fs,default_acl=public-read,uid=1001,gid=65534   0 0

Links
https://github.com/s3fs-fuse/s3fs-fuse
https://gridscale.io/community/tutorials/s3-fuse-ubuntu/