Preventing data disaster

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This article should help to avoid data loss and gives some hints.

Data security when using LibreOffice

Preventing data disaster

Every morning someone gets up, goes to the computer and observes:

″My data has disappeared, yesterday or just a moment ago they were still there″, see also Links to AskLibreOffice.

One way or another, it happens every day. We don't know how many people are affected.

Is it thoughtlessness, recklessness, indifference, or the hope ″Oh, nothing's gonna happen".

"It's all worked out fine so far".

But, the data disaster has just struck!

Then the panic is great.

Whether it is a job for school, university, employer or yourself, it is usually just important and urgent information that you have written down or entered, because it must be ready today or immediately.

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Why can data be lost?

Here are a few examples:

  • The storage medium (hard disk, SSD, CD, DVD or stick) has been damaged and data can no longer be read.
  • The edited file was not saved, or the saving process was interrupted.
  • The edited file was saved in an incorrect file format.
  • Your cloud provider's app is not working as intended.
  • A system restore has removed the files on your desktop.
  • The program you were working with crashed unexpectedly.
  • An essential computer component suddenly fails.
  • There is a voltage dip or power failure.
  • The user overwrites a created file with an empty file.
  • The user accidentally deletes the created file.

The reality of why data is lost could go on and on.

However, most errors are not caused by hardware or software, but by the user.

How can we largely prevent data loss?

To prevent data from being lost, the so-called data backup is used.

And there are many possibilities.

It already starts with the editing of a document.

The more important a document is to you, the more often you should save it.

LibreOffice intern

Dialog box: Options Load/Save – General
Path - Backup copies
Dialog "Options - LibreOffice - Advanced"
Dialog "Expert Configuration"

Saving Documents Automatically from latest help.


LibreOffice offers via the menu Tools ▸ Options ▸ Load/Save ▸ General at ″Save″ the possibility to save the AutoRecovery information every "X minutes" ("X" stands for the number of minutes).

LibreOffice uses the AutoRecovery information to recover a file after a crash.

What is the option Backup copy for and how do I recover a document?

File Backup

In addition, a check mark can be set there to ″Always create a backup copy″.

This means that when you save a document, the previously saved status of the document is saved in a copy with the extension .bak.

The next time you save, it will be overwritten by the next state.

This is an action that is primarily intended to enable you to go back to an earlier status yourself if you have made mistakes while editing a document.

Backup copies are stored in the directory that is defined in Extras there at Backup copies is set.

Under Windows 10, the backup copies are stored by default in the directory C:\Users\USERNAME\AppData\Roaming\LibreOffice\4\user\backup deposited.

If you have created a partition on your hard disk in the PC or have a second hard disk there, you can consider changing the backup directory there.

If you cannot open a *.BAK file in LibreOffice, you can rename it to .ODT or make a file association in the operating system for .BAK.

See: Change default programs

If you use other programs that also store .BAK files, you may want to disable permanent association.

See also: Extension

What is the option Backup copy for and how do I recover a document?

Lock file

Format representation of a lock file: .~lock.FILENAME.FILEext#

The lock file is located in the same directory as the opened document or it is created there when opened 1).

The prerequisite for this is that the directory being worked in has write permission.

The lock file is created when a document is opened and normally deleted when the document is closed.

Its purpose is to prevent more than one user from editing a document in a multi-user environment, which would be a problem.

The first user who opens the file can edit the document, but all subsequent users who open the document can only read it.

That is, it is needed for two purposes:

  1. With some file systems, there is no (reliable) locking of a file when an application opens it. This can lead to the file being opened for editing by two (or more) applications (e.g. over a network), which then write to the file independently, with disastrous consequences. In this case, creating the lock file tells the other LibreOffice/OpenOffice (the two applications that know to look for the file) that the file is already in use.
  2. Also, the lock file contains the information about who and where opened the file, which is helpful, if a user wants to edit a file that has already been opened by another user, and when he sees this information, he can call the other user and ask him to close the file.

It may happen that the lock file cannot be deleted if Office or the operating system blocks.

For example, it might be left over if LO crashed while a file was open, so that no normal exit occurred.

The lock file then remains in the directory.

In this case, the file is opened in read-only mode.

The lock file must be deleted to restore edit mode.

For example, if your file is MyFile.odt:

Look for a file .~lock.MyFile.odt# in the same directory.

If the corresponding lock file exists there, it is a remnant of an editing session, which was not closed properly due to an error.

Delete it before opening MyFile.odt again.

In Windows, the lock file is a hidden file and you need to set Windows to show hidden files.

In your file manager enter %AppData% to see the hidden files, see also Show hidden files, folders and drives.

1) If you don't want this, your only option is to disable locking altogether, go to Tools ▸ Options ▸ LibreOffice ▸ Advanced and 
 click on the button: Expert Settings….
 Search for: UseLocking and set org.openoffice.Office.Common\Misc\UseLocking to false.

Simple file duplication

In the simplest case you create a copy of the file.

However, if it is on the same data medium as the original, both versions of the file can be lost if the data medium is defective.

So it makes sense to save a copy of the important files on an external data medium.

Short-term storage or -backup

When working on a file, never save directly to an external disk connected via USB.

USB is relatively slow (compared to data transfer to main memory) and saving operations are "asynchronous" - that is: The operating system reports a completed save operation as soon as all data is in a memory buffer (in main memory).

But this does not mean that the data is already mapped to the (USB) memory!

Remember that a memory stick or an external hard disk has not yet saved all data when the file manager signals the end of the save operation.

Use the possibilities of your operating system, with the function Hardware safely remove and medium eject ▸ Medium eject of the data medium.

Therefore, always save their files first in principle on an internal drive in your PC.

Then you can use a memory stick or an external hard drive for short-term storage or backup.

For example, use your file manager to save a file from the internal drive to a memory stick or external hard drive.

 Observe the memory stick or external hard disk until the indicator lamp stops flashing or the operating system releases the external memory.

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Data backup

An already quite professional data backup is achieved if you use

  1. a program for data backup and
  2. external storage (External Hard_disk_driveWikipedia logo v3.svg, Network-attached_storageWikipedia logo v3.svg, Cloud_computingWikipedia logo v3.svg) is used.

Data backup program

A backup program has the advantage that a complete backup of the computer data is usually performed.

This requires data medium that is large enough to store all this data.

Programs for data protection are also called backup programs for short.

These usually have extensive functions, such as:

  • the time planning of the backup
  • use of a backup scheme, such as incremental backup
  • possible encryption of the backup
  • possible password protection
  • Validation of the backup

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Time/quantity factor

The time-volume factor plays an important role in data backup.

You should make this dependent on how many new files you create in a certain period of time and to what extent.

If you are a frequent writer or edit complex databases, you should back up your data as often as possible.

For this purpose you can use all the options listed above for your needs.

Data backup planning

Think carefully about what is the best procedure for you to keep your data as secure as possible.

The best thing is to make a note of what you want to do, make a backup plan.

Try to automate the backup process as much as possible.

And make a checklist of the actions to be taken manually.

See also Organisation on the PC - File management.

Residual risk

You have probably already noticed that a small residual risk always remains, but it is very low with correct data backup.

Surely you will not initiate the backup after every written word, but consider what can be restored with a radjusted effort.

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Backing up the user profile at regular intervals

The user profile is the folder where all user-related data such as extensions, custom dictionaries, document templates, etc. are stored.

The more you make changes to it, the more sensible it is to create a backup afterwards.

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Further Informations

Show hidden files

Show hidden files, folders and drives.

As described above, enter %AppData% in your file manager to see the hidden files.

For a permanent display of the hidden items:

Show hidden files and folders in Windows

Windows 10

1. Open File Explorer from the taskbar.

2. Select View ▸ Options ▸ Change folder and search options.

3. From the "View" tab and under "Advanced settings", select "Show hidden files, folders and drives" and OK.

Windows 11

1. Open File Explorer from the taskbar.

2. Select View ▸ Show ▸ Hidden Items.

Or click on the icon ThreePointIcon.png and choose Options and select "Show hidden files, folders and drives" from the View tab and under Advanced Settings and OK.

Antivirus/Defender - Controlled folder access exception

Setting up a controlled folder access exception for Defender for LibreOffice

Possible printer troubleshooting under LibreOffice

Please check the information given here for your printer.

Manufacturer specifications

Which manufacturer is the printer from?

What type, model of printer do you use?

Is it a multi-function printer?

For information about your printer, refer to the printer manual or the printer manufacturer's website.

Has the printer been installed with its required components in the operating system?

Does the printer have an up-to-date printer driver?

Connections / Interfaces

Is the printer switched on?

Is the printer connected to the PC?

What is the connection of the printer - USB, Wifi, Network?

In case of USB connection, check the connectors on the PC and printer.

Check if the printer selected in the print dialog is the currently connected version, e.g. if it is connected via WiFi but was originally set up via USB, make sure that the printer connected via WiFi is selected and not the USB.

Also, if it is a multi-function printer, make sure that the fax printer is not selected.

Is the printer registered as the default printer in the operating system?

Have you accidentally marked a space? Then deselect it.


Is there enough paper in the printer?

Has the correct paper tray been selected on the printer?

Was the paper (envelope, etc.) loaded correctly?

Ink / Toner

Is there enough toner or ink available?

For inkjet printers, check if a print head cleaning needs to be initiated.

Is your toner cartridge in order, the toner not gummed up.

Removing the toner cartridge and gently shaking it may help.

Put old newspaper under it.

Advanced Check

Can you print from other applications?

Select older LibreOffice version from archive

 It is strongly recommended to download the latest supported LibreOffice versions from and use them.
 Older versions are no longer maintained and they may contain security vulnerabilities and risks.

A video link on the topic (in German [DE]): Ältere LibreOffice Version aus dem Archiv auswählen

Using Windows as an example

You can download older versions of LibreOffice from the archive.

As an example, search for version, Windows 64 bit, with the helppack /en.

Select older LibreOffice version from archive,

Enter the following link in your internet browser:

You are now on the home page of the LibreOffice archive.

Here all previous versions of LibreOffice are listed and can be selected.

Since LibreOffice exists for different operating systems and bit-values, you will be taken step by step from the first click on the versions.

The page starts with version

Scroll down to see higher versions.

Now click on the version number you want.

In the next selection, choose the operating system name you want.

In this example select "win".

The next selection determines whether 32 - or 64 bit.

Select "x86_64/" for 64 bit.

In the following selection you see now the actual program and different helppack files for different languages.

Click above the program "LibreOffice_6.4.7.2_Win_x64.msi".

The download for the program LibreOffice version, 64 bit starts.

When the download is finished click on the helppack "LibreOffice_6.4.7.2_Win_x64_helppack_en.msi" below.

When you have downloaded the program and helppack, you can start the installation on your PC.

Links to AskLibreOffice

Links to [EN]



One way to do this is the extension TimeStampBackup:

If you use the icon or command provided by this extension instead of the ″Save″ icon or menu command, each time you save, a copy of the previous state is saved under a unique name containing the date and time so that you have a history of your saved versions.

Organisation on the PC

Organisation on the PC - File management

File management

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Documentation / Manuals

Here you will find the Documentation / Manuals:

Documentation / Manuals

Any questions?

For questions on this topic go to:


Get Involved

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Get Involved

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Link to the Video

Link to the Video:

Preventing data disaster – LibreOffice 6.4

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