Backup Job is configured as Incremental or Differential but everytime it runs, a new Full is created. In the Task log we can find following:
[2013-06-03 00:04:43.610]: Test connection to repository Repo_1 starting...
[2013-06-03 00:04:44.094]: Test connection to repository Repo_1 successful!
[2013-06-03 00:04:44.546]: Ending task validation... success!
[2013-06-03 00:04:44.546]: Beginning initialization of backup information.
[2013-06-03 00:04:44.546]: Retrieving the tasks parent information.
[2013-06-03 00:04:45.139]: Retrieving save points for any full backups associated with this job.
[2013-06-03 00:04:45.264]: Verifying content of repository.
[2013-06-03 00:04:47.074]: WARNING - The current task depends on the following files, which are corrupted or missing from the repository: <relative path to the previous Full savepoint>/<VM>_F.Manifest.metadata; <relative path to the previous Full savepoint>/<VM>_F.VmConfig.metadata
[2013-06-03 00:04:47.089]: WARNING - The following error was received while trying to verify previous backup artifacts:An internal error occurred during execution, please contact Quest support if the error persists. Error Message: 2916 - CIFS cannot connect to share
[2013-06-03 00:04:47.089]: Finished initialization of backup information successfully.
[2013-06-03 00:04:47.089]: A Full backup will be run for this task.
[2013-06-03 00:24:00.228]: Commiting savepoint data to Repo_1 completed.
[2013-06-03 00:24:02.397]: Verifying the content of the repository completed.
[2013-06-03 00:24:02.836]: Setting VM event completed.
Backup is successful. Ranger can't read existing Full SP. Repo Properties are OK, free space displayed.
create explicit/normal share (not admin share like D$, E$);
grant Full Control to Everyone (Sharing Permissions);
create repo using this share;
reconfigure backup jobs to use a new repo.