Windows Action Center notification icon says Backup in Progress when no backup is occurring
A few solutions present themselves after some googling
One is to bite the bullet and enable the backup schedule. The notification now apparently dissappears in some time (hrs). Cypher2Dex claims, in this post that this fixed it for him/her, and that it might be because the backup was disabled in the middle of a backup and it got messed up due to it.
Alternatively, you could follow spunk.funk in this forum and disable backup notifications from turning up in action center. To do this,
Right click the Action Center flag by the clock and choose Open Action Center/Change Action Center Settings on the left panel. Under Windows Messages Uncheck the Box Windows Backup.
A third post suggests if a backup did happen once, and onto a external disk, maybe the disk was removed "unsafely" or prematurely.
- Right click Action Center
- Select Open Action Center
- Select Change Action Center Settings
- Under Maintenance Messages, uncheck Windows Backup.