Wait between retrievals to keep load down

Let's try with 0.05s first.

snapshotter.sh

 #!/bin/bash
 set -o nounset -o errexit -o pipefail
 ALBS_PARALLELIZE_DOWNLOAD="${ALBS_PARALLELIZE_DOWNLOAD:-false}"
+ALBS_DOWNLOAD_WAIT="${ALBS_DOWNLOAD_WAIT:-0.05}"
 ALBS_RANGE_DOWNLOAD_ENABLED="${ALBS_RANGE_DOWNLOAD_ENABLED:-false}"
 ALBS_RANGE_DOWNLOAD_CHUNK="${ALBS_RANGE_DOWNLOAD_CHUNK:-$(date +%-d)}"
 ALBS_RANGE_DOWNLOAD_CHUNKS="${ALBS_RANGE_DOWNLOAD_CHUNKS:-10}"
@@ -41,6 +42,7 @@ function _download() {
        --max-redirect 0 \
        --user-agent="${user_agent}" \
        --no-verbose \
+       --wait="${ALBS_DOWNLOAD_WAIT}" \
        --input-file=<(printf "%s\n" "${@:2}") || [[ ${?} = 8 ]] # 8 Server issued an error response.
 }