I had to setup a quick backup to s3 storage to replace an aging rsnapshot setup. I looked at Borg, but Duplicity (https://duplicity.us/) was easier to configure and connect to S3.
For syncing S3 storage across providers, I went with rclone (https://rclone.org/). Note that using rclone to sync across providers (e.g. from Amazon to Wasabi) does require the files to be downloaded to the client machine and then uploaded again. Not ideal, but if you have extra bandwidth it is a convenient setup.
For syncing S3 storage across providers, I went with rclone (https://rclone.org/). Note that using rclone to sync across providers (e.g. from Amazon to Wasabi) does require the files to be downloaded to the client machine and then uploaded again. Not ideal, but if you have extra bandwidth it is a convenient setup.