Warren d76a200560 Add incremental backup support (Phase 8) ...

BackupScheduler Enhancement:
- Added incremental: bool field to BackupScheduleConfig
- Default: incremental=true (enabled by default)
- copy_incremental_to_snapshot() method
- file_changed() detection (size + mtime comparison)
- Hardlink unchanged files to base snapshot (ZFS-style)

Incremental Backup Algorithm:
1. If incremental=true and previous snapshot exists:
   - Compare file size and mtime with base snapshot
   - If unchanged: create hardlink to base (zero disk usage)
   - If changed: copy and compress (new content)
2. If incremental=false or no previous snapshot:
   - Full copy (traditional backup)

Storage Savings:
- Unchanged files: hardlink (0 extra disk space)
- Changed files: copy + compress (minimal overhead)
- Similar to ZFS snapshot mechanism

BackupConfigResponse Updated:
- Added incremental field
- Added compress field (GUI: dropdown select)

Backup.vue Updated:
- Incremental switch with explanation text
- Compression dropdown (None/LZ4/ZSTD)
- Default values loaded from backend

REST API Test:
curl /api/v2/backup/config
{incremental:true,compress:zstd,...}

Build: 495 tests pass

2026-06-24 04:20:33 +08:00

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