Saving Documents Automatically
To create a backup file every time that you save a document
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Choose LibreOffice - PreferencesTools - Options - Load/Save - General.
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Mark Always create a backup copy.
If the Always create a backup copy option is selected, the old version of the file is saved to the backup directory whenever you save the current version of the file.
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You can change the backup directory by choosing LibreOffice - PreferencesTools - Options - LibreOffice - Paths, then change the Backups path in the dialogue box.
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The backup copy has the same name as the document, but the extension is .BAK. If the backup folder already contains such a file, it will be overwritten without warning.
To save recovery information automatically every n minutes
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Choose LibreOffice - PreferencesTools - Options - Load/Save - General.
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Mark Save AutoRecovery information every and select the time interval.
This command saves the information necessary to restore the current document in case of a crash. Additionally, in case of a crash LibreOffice tries automatically to save AutoRecovery information for all open documents, if possible.