feat(backup): incremental NAS backup support for KVM#13074

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jmsperu wants to merge 9 commits intoapache:mainfrom

jmsperu:feature/nas-backup-incremental

Commits on Apr 27, 2026

docs: add RFC for incremental NAS backup support (KVM)
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feat(backup): add chain-metadata keys + nas.backup.full.every config
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feat(backup): nasbackup.sh full+incremental modes via backup-begin
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feat(backup): orchestrate full vs incremental in NAS provider
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feat(backup): on-demand bitmap recreation for incremental NAS backup
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feat(backup): restore path follows incremental backing-chain
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feat(backup): cascade-delete + chain repair for NAS incrementals
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test(backup): smoke tests for incremental NAS backup chain
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Commits on Apr 28, 2026

test(backup): mock returns no-backing-chain for rsync-failure test
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