<p>Your Persistent Storage will be preserved by both automatic and
manual upgrades.</p>

<h1 id="check-version">Checking which version of Tails you are currently running</h1>

To know yourcheck which version of Tails you are currently running, choose
<span class="menuchoice">
<span class="guimenu">Applications</span>&nbsp;▸
<span class="guisubmenu">Tails</span>&nbsp;▸
<span class="guimenuitem">About Tails</span>
</span>.

To check which version of Tails you are currently running, choose
<span class="menuchoice">
<span class="guimenu">Applications</span>&nbsp;▸
<span class="guisubmenu">Tails</span>&nbsp;▸
<span class="guimenuitem">About Tails</span></span>.

The advantages of this techniqueautomatic upgrades are the following:

The advantages of automatic upgrades are the following:

- The upgrade is much smaller to download than a full ISOUSB image.

- The upgrade is much smaller to download than a full USB image.

- A Tails USB stick

- An Internet connection.

- An Internet connection

<p>If you cannot upgrade at startup (for example, if you have no network
connection by then), you can start <span class="application">Tails
Upgrader</span> later by opening a terminal and executing the following
command:</p>

<p>If you cannot upgrade at startup (for example, if you have no network
connection by then), you can start <span class="application">Tails
Upgrader</span> later by opening a terminal and executing the following
command:</p>

<h2 id="troubleshooting">Troubleshooting</h2>

If an error occurs during the upgrade, the assistant proposes you to read one of the following pages:

If an error occurs during the upgrade, the assistant proposes you to read one of the following pages:

If your Tails USB stick fails to start after an automatic upgrade, see below how to do a manual upgrade.

<h2 id="reduce">Reducing the size of the download</h2>

When doing automatic upgrades, the size of the download increases over time.

You can reduce the size of the download of future automatic upgrades by doing a [[manual upgrade|upgrade#manual]] to the latest version.

Your Tails USB stick stores:

1 **base** version that you first installed or to which you last did a manual upgrade

1 **upgrade** package containing all the changes made to Tails since the base version

[[!img upgrader_manualsystem.png link="no" class="svg" alt=""]]

[[!img system.png link="no" class="svg" alt=""]]

For example, if you install a Tails USB stick with 4.6, the base version is 4.6, and:

- The upgrade to 4.7 is 181 MB.