Data loss is extremely rare in Toggl as we have several layers of data redundancy. Data is mirrored into a separate data center in real-time. We also make full data backups every 12 hours.
Thus, the likelihood is that your time entries are still all there, it’s just a question of finding it. Take these steps to locate your data:
Open Reports and check that the Calendar is set to the right time period
The default calendar value is "This Week" so you often need to change the date range here in order to see your time.
If you do see your data inside a Toggl app (mobile or desktop), but entries are not appearing in Reports, it may be that your app is suffering from syncing issues.
In that case, please do not log out of the app as it may cause data loss. Instead, try to force sync and contact Toggl support at email@example.com.
Double check that you are in the correct workspace
Reports in Toggl are workspace-specific -- meaning you need to generate a separate report for each of your workspaces.
You can switch Workspaces by clicking on the workspace selector in the bottom-left corner and selecting the relevant workspace inside the sub-menu that opens.
Check whether you're logged into the correct Toggl account
Perhaps you have a work account and a personal account? Since we don't require email confirmation, it's not uncommon for users to create a new account instead of logging in.