Add note about restoring when resource scaled to 0

[a-mccarthy]

Signed-off-by: Abigail McCarthy [email protected]

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Please add a summary of your change

This adds a note that Velero will not restore using restic when a resource is scaled to 0 on a cluster. Also makes it clear that volumes to be restore with restic i identified with the backup.velero.io/backup-volumes annotation.

Does your change fix a particular issue?

Fixes #1919

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file or added /kind changelog-not-required as a comment on this pull request.
• Updated the corresponding documentation in site/content/docs/main.

[codecov-commenter]

Codecov Report

Merging #4911 (8f31bff) into main (89907bd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4911   +/-   ##
=======================================
  Coverage   41.69%   41.69%           
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  Files         204      204           
  Lines       18263    18263           
=======================================
  Hits         7615     7615           
  Misses      10069    10069           
  Partials      579      579           

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