Home and Professional versions of Genie Timeline will purge/consolidate older backups to save space. Older Backups are collected into fewer ticks on the Timeline, so the timeline will show frequent backups for the past 4 hours, hourly backups for the past 48 hours, daily backups for the past week, weekly backups onwards.
When the drive's free space is low, Genie Timeline automatically deletes old versions of backed up files to free space. However, if Genie Timeline is unable to find old versions to delete, the backup will stop when there is 500MB of free space left. Genie Timeline will update the interface to show that the drive needs to be replaced.
Users may tend to disconnect the drive; therefore, the backup will stop, but will not display the warning unless an action has not been taken within 7 days. If the same drive is inserted, even if the drive letter has changed, Genie Timeline will resume backup without any user intervention.
Note
Replacing your drive immediately after it becomes full is highly recommended to be fully protected.