The first brown leaves of the year. The sound of cicadas makes me think about prime numbers.
Given that you have the AWS CLI installed and configured, here are a few examples of syncing directories with S3.
Sync your home directory:
aws s3 sync $HOME s3://homeof$USER
E.g. $USER is sil and $HOME is /home/sil, then this will copy all files from /home/sil to bucket homeofsil.
To download the files back to another directory:
aws s3 sync s3://homeof$USER $HOME/oldhome
More details about S3 Sync in the official documentation.