Add Cancel/Abort action to “Run backup” operation #7813
Description
The “Run backup” operation of Backup page currently lacks a visible Cancel or Abort button.
An immediate backup run can be started with one click, there is no way to stop it if started accidentally.
Proposed improvement
- Add a Cancel (or Abort) action during manual backup execution.
- Clearly communicate the backup state and whether it can be safely interrupted.
Acceptance conditions
- An interrupted backup run must not raise any "Failed backup" alert.
- Any change to Restic repository should be simply discarded or not available for restore.
See also
- The Clone/Move task can be canceled. A similar pattern is acceptable.
- https://mattermost.nethesis.it/nethesis/pl/p8uu8moi47rbxcmg58ersjcywc