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guide$backup-restore$optionsFlags
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However, the customisations will not be remembered for the future backups.
If you want to customise this dialog, use \hyperref[subsubsec:settings-backup-options]{Backup Options} in the \hyperref[sec:settings-page]{Settings page}.
A complete description of the backup options is given below:
\begin{itemize}
\item \textbf{APK files.} Whether to back up the APK files.
This includes the \textit{base APK} file along with the \texttt{split APK} files if they exist.
\item \textbf{Internal data.} Whether to back up the internal data directories.
These directories are located at \texttt{/data/user/<user\_id>} and (for Android N or later) \texttt{/data/user\_de/<user\_id>}.
\item \textbf{External data.} Whether to back up data directories located in the internal memory as well as SD Card (if exists).
External data directories often contain non-essential app data or media files (instead of using the dedicated media folder) and may increase the backup size.
However, it might be essential for some apps.
Although it isn't checked by default (as it might dramatically increase the size of the backups), you may have to check it in order to ensure a smooth restore of your backups.
\begin{warning}{Caution}
Internal data folders should always be backed up if you are going to back up the external data folders.
However, it could be useful to back up only the external folders if the app in question downloads a lot of assets from the Internet.
\end{warning}
\item \textbf{OBB and media.} Whether to back up or restore the OBB and the media directories located in the
external storage or the SD Card.
This is useful for games and the graphical software which actually use these folders.
\item \textbf{Cache.} Android apps have multiple cache directories located at every data directories (both internal and external).
There are two types of cache: \textbf{cache} and \textbf{code cache}.
Enabling this option excludes both cache directories from all the data directories.
It is generally advised to exclude cache directories since most apps do not clear the cache regularly (for some
reason, the only way an app can clear its cache is by deleting the entire cache directory) and usually handled by the OS itself.
Apps such as Telegram may use a very large cache (depending on the storage space) which may dramatically increase the backup size.
When it is disabled, AM also ignores the \textbf{no\_backup} directories.
\item \textbf{Extras.} Backup/restore app permissions, net policy, battery optimization, SSAID, etc., enabled by default.
Note that, blocking rules are applied \textit{after} applying the extras.
So, if an item is present in both places, it will be overwritten (i.e., the one from the blocking rules will be used).
\item \textbf{Rules.} This option lets you back up blocking rules configured within App Manager.
This might come in handy if you have customised permissions or block some components using App Manager as they will
also be backed up or restored when you enable this option.
\item \textbf{Backup Multiple.} Whether this is a multiple backup.
By default, backups are saved using their user ID\@.
Enabling this option allows you to create additional backups.
These backups use the current date-time as the default backup name, but you can also specify custom backup name
using the input field displayed when you click on the \textbf{Backup} button.
\item \textbf{Custom users.} Backup or restore for the selected users instead of only the current user.
This option is only displayed if the system has more than one user.
\item \textbf{Skip signature checks.} When taking a backup, checksum of every file (as well as the signing
certificate(s) of the base APK file) is generated and stored in the \texttt{checksums.txt} file.
When you restore the backup, the checksums are generated again and are matched with the checksums stored in the said file.
Enabling this option will disable the signature checks.
This option is applied only when you restore a backup.
During backup, the checksums are generated regardless of this option.
\begin{warning}{Caution}
You should always disable this option to ensure that your backups are not modified by any third-party applications.
However, this would only work if you enabled encryption.
\end{warning}
\end{itemize}
\seealsoinline{\hyperref[subsubsec:settings-encryption]{Settings: Encryption}}
However, the customisations will not be remembered for the future backups.
If you want to customise this dialog, use \hyperref[subsubsec:settings-backup-options]{Backup Options} in the \hyperref[sec:settings-page]{Settings page}.
A complete description of the backup options is given below:
\begin{itemize}
\item \textbf{APK files.} Whether to back up the APK files.
This includes the \textit{base APK} file along with the \texttt{split APK} files if they exist.
\item \textbf{Internal data.} Whether to back up the internal data directories.
These directories are located at \texttt{/data/user/<user\_id>} and (for Android N or later) \texttt{/data/user\_de/<user\_id>}.
\item \textbf{External data.} Whether to back up data directories located in the internal memory as well as SD Card (if exists).
External data directories often contain non-essential app data or media files (instead of using the dedicated media folder) and may increase the backup size.
However, it might be essential for some apps.
Although it isn't checked by default (as it might dramatically increase the size of the backups), you may have to check it in order to ensure a smooth restore of your backups.
\begin{warning}{Caution}
Internal data folders should always be backed up if you are going to back up the external data folders.
However, it could be useful to back up only the external folders if the app in question downloads a lot of assets from the Internet.
\end{warning}
\item \textbf{OBB and media.} Whether to back up or restore the OBB and the media directories located in the
external storage or the SD Card.
This is useful for games and the graphical software which actually use these folders.
\item \textbf{Cache.} Android apps have multiple cache directories located at every data directories (both internal and external).
There are two types of cache: \textbf{cache} and \textbf{code cache}.
Enabling this option excludes both cache directories from all the data directories.
It is generally advised to exclude cache directories since most apps do not clear the cache regularly (for some
reason, the only way an app can clear its cache is by deleting the entire cache directory) and usually handled by the OS itself.
Apps such as Telegram may use a very large cache (depending on the storage space) which may dramatically increase the backup size.
When it is disabled, AM also ignores the \textbf{no\_backup} directories.
\item \textbf{Extras.} Backup/restore app permissions, net policy, battery optimization, SSAID, etc., enabled by default.
Note that, blocking rules are applied \textit{after} applying the extras.
So, if an item is present in both places, it will be overwritten (i.e., the one from the blocking rules will be used).
\item \textbf{Rules.} This option lets you back up blocking rules configured within App Manager.
This might come in handy if you have customised permissions or block some components using App Manager as they will
also be backed up or restored when you enable this option.
\item \textbf{Backup Multiple.} Whether this is a multiple backup.
By default, backups are saved using their user ID\@.
Enabling this option allows you to create additional backups.
These backups use the current date-time as the default backup name, but you can also specify custom backup name
using the input field displayed when you click on the \textbf{Backup} button.
\item \textbf{Custom users.} Backup or restore for the selected users instead of only the current user.
This option is only displayed if the system has more than one user.
\item \textbf{Skip signature checks.} When taking a backup, checksum of every file (as well as the signing
certificate(s) of the base APK file) is generated and stored in the \texttt{checksums.txt} file.
When you restore the backup, the checksums are generated again and are matched with the checksums stored in the said file.
Enabling this option will disable the signature checks.
This option is applied only when you restore a backup.
During backup, the checksums are generated regardless of this option.
\begin{warning}{Caution}
You should always disable this option to ensure that your backups are not modified by any third-party applications.
However, this would only work if you enabled encryption.
\end{warning}
\end{itemize}
\seealsoinline{\hyperref[subsubsec:settings-encryption]{Settings: Encryption}}