S3: mount as filesystem under Linux

Install
sudo apt install -y s3fs

Configuration
# cat ~/.passwd-s3fs
AWS Access Key ID:AWS Secret Access Key

Mount
s3fs backup /media/backup -o url=https://s3.example.com,allow_other,umask=0000
# -o passwd_file=/etc/passwd-s3fs
# -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://gridscale.io/community/tutorials/s3-fuse-ubuntu/