Document safety of refresh period on wrong estimate

Description

I'll add the following clarification to the docs:

It is recommended that the refresh period be higher than the expected copy time; if a copy operation is still being performed when the next refresh triggers, the second refresh is skipped: it's safe to set this value low even when the copy time is not known.

Environment

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Status

Assignee

Sanne Grinovero

Reporter

Sanne Grinovero

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Fix versions

Priority

Trivial