Given that you have the AWS CLI installed and configured, here are a few examples of syncing directories with S3.
Sync your home directory:
[bash]
aws s3 sync $HOME s3://homeof$USER
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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:
[bash]
mkdir $HOME/oldhome
aws s3 sync s3://homeof$USER $HOME/oldhome
[/bash]
More details about S3 Sync in the official documentation.