vfs: add BackupMeta in config

[SandyXSD]

Partially resolves #1452

[codecov-commenter]

Codecov Report

Merging #1460 (8ab94f8) into main (e8384e7) will decrease coverage by 0.15%.
The diff coverage is 19.04%.

@@            Coverage Diff             @@
##             main    #1460      +/-   ##
==========================================
- Coverage   59.36%   59.20%   -0.16%     
==========================================
  Files         131      131              
  Lines       21950    21967      +17     
==========================================
- Hits        13030    13005      -25     
- Misses       7372     7408      +36     
- Partials     1548     1554       +6     

Impacted Files	Coverage Δ
cmd/gateway.go	29.44% <0.00%> (-0.17%)	⬇️
pkg/object/restful.go	20.15% <0.00%> (-0.32%)	⬇️
pkg/vfs/vfs.go	77.51% <ø> (ø)
cmd/format.go	62.50% <7.69%> (-3.14%)	⬇️
cmd/mount.go	72.52% <100.00%> (+0.08%)	⬆️
pkg/chunk/cached_store.go	70.76% <0.00%> (-3.47%)	⬇️
pkg/meta/tkv.go	75.20% <0.00%> (-0.65%)	⬇️
pkg/meta/sql.go	68.23% <0.00%> (-0.21%)	⬇️
pkg/chunk/disk_cache.go	80.78% <0.00%> (+1.97%)	⬆️

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