fix: correct API endpoints related to backup issues

[ruibaby]

What type of PR is this?

/area ui
/kind bug
/milestone 2.19.x

What this PR does / why we need it:

修复备份相关的 API 接口地址错误的问题，此问题由 #6486 引入，后端修改地址之后，前端没有对应修改。

Does this PR introduce a user-facing change?

None

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.19%. Comparing base (6cd8dc8) to head (10c159e).
Report is 8 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6506      +/-   ##
============================================
+ Coverage     58.18%   58.19%   +0.01%     
+ Complexity     3774     3773       -1     
============================================
  Files           651      651              
  Lines         22125    22128       +3     
  Branches       1538     1538              
============================================
+ Hits          12873    12877       +4     
  Misses         8641     8641              
+ Partials        611      610       -1     

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[guqing]

/lgtm

[f2c-ci-robot]

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