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# Important Information

Here is some important information that you must absolutely know before using OnyX.

## Backup your data:

Before using OnyX, backup your data.
OnyX is not bug free, and no user is infaillible. Back up your data using Time Machine or any third party backup utility.

## Verifying startup disk:

Before running Maintenance or Cleaning tasks, it's strongly recommended to check the S.M.A.R.T. status of the startup disk and its system files.
These vérifications are essential and can be made at the OnyX launch or from the "Verify" panel. Errors in the structure of system files are not uncommon and can have disastrous consequences if they're not repaired.

## Computer freezes:

OnyX cannot destroy the System.
If your computer freezes during the verification of the volume, you need not worry. This is an expected and normal behaviour! Once OnyX has finished checking, control will be returned to you.

## Personal data removed:

OnyX doesn't remove your personal data…
...but you must observe certain basic rules regarding the file system. MacOS X is a Unix based operating system and has a well defined structure. Your data must be stored in your HOME directory, in the existing Folders, e.g. 'Documents', 'Pictures', 'Music', etc..., or in additional Folders that you have previously created in your HOME directory. You should never store your documents or applications in folders that are subordinated to the operating system, e.g. folders named 'Library', 'System', or in any of the subfolders of these folders.
Anybody can make a mistake, or handle data incorrectly...
Back up your data regularly!

## Problem with a hidden function:

OnyX will not always be able to correct a function that has an undesirable behavior.
In fact, the functions in the Parameters panel were created by the developers of the System or of the application concerned. OnyX merely enables or disables those functions, using a simple command, at your discretion. If one of those functions causes a problem, disable it. Do not forget: if a function is hidden, there must be a good reason...

## Updates:

Always update OnyX and your System.
The last versions correct generally at least a part of the problems encountered in previous versions.

## Uninstall OnyX:

To uninstall OnyX, go in the OnyX menu and select "Uninstall OnyX...". In the confirmation message which appears, click the Continue button. The application and the components created while installing and using OnyX will be removed.

To cancel the display this warning on OnyX launches, go to Preferences> "Messages and logs", and deselect the "Display important Info" option.