Correctly fallback during backup copy

[antonio2368]

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• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix creating backups to S3 buckets with different credentials from the disk containing the file.

If native copy was disabled or it failed for some known reasons, native copy will fallback to copying using read/write. The problem was that we created both buffers using same client while their credentials could differ.

cc @vitlibar

Documentation entry for user-facing changes

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