USHIFT-4705: Check disk space before backing up / restoring

[pmtk]

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[openshift-ci-robot]

@pmtk: This pull request references USHIFT-4705 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.18.0" version, but no target version was set.

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[jerpeter1]

/hold
@pmtk - you might consider padding the "space required" that's reported by a bit to account for any ongoing changes that might be in flight while it's being calculated - but otherwise looks fine - unhold if you feel like it

[jerpeter1]

/lgtm

[pmtk]

/unhold

[pacevedom]

Padding some extra space was added, so lgtm again.

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerpeter1, pacevedom, pmtk

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