@Tonio_Vanzetti I’m sorry for not responding sooner.
Insync does have a file matching system in place that should help reduce bandwidth consumption when you add your new account. This will still take some time though, for Insync to process and match the existing local files with ones on Drive for the new account.
File matching will be automatically done when you add the new account, then select the local folder with the existing files.
Some possible issues:
- In rare cases, duplicates may be created when file matching fails.
- Link files (.gddoc, .gdsheet, etc.) will not be matched properly because the IDs of those files would have changed when you moved them to the new account (unless multicloud reuses IDs and just re-assigns ownership). This can be resolved by deleting the link files and letting Insync re-create them.