- Add backup capability before updates or as standalone action
- Implement storage service to fetch and parse backup-capable storages from PVE nodes
- Add backup storage selection modal for user choice
- Support backup+update flow with sequential execution
- Add standalone backup option in Actions menu
- Add storage viewer in server section to show available storages
- Parse /etc/pve/storage.cfg to identify backup-capable storages
- Cache storage data for performance
- Handle backup failures gracefully (warn but allow update to proceed)
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