Also read Moving and Copying data using gsutil
and Providing External User Access to Cloud Storage Buckets
gsutil versus Transfer Service - Both are free - so how do you decide which one to use where?
Do you need both ingress and egress?
Remember that Transfer Service is only for ingress. gsUtil can be used for both.
Where is the source data?
gsUtil is recommended for on premises to GCP Transfers
Transfer Service is recommended for cloud to cloud transfers
Ongoing (Scheduled) or One Time Transfer?
For ongoing transfers (ingress only), Transfer Service is easier to configure.
Summary
This was meant to be a quick decision matrix for when to use which service ( gsutil or Transfer Service ) to transfer data INTO and OUT of GCP. Also read Moving and Copying Data using gsUtil
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