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Merge pull request #2867 from nextcloud/enh/noid/adjust-migration-docs

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adjust migration docs
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@ -24,7 +24,7 @@ The procedure for migrating only the files works like this:
The procedure for migrating the files and the database works like this:
1. Make sure that your old instance is on exactly the same version like the version used in Nextcloud AIO. (e.g. 23.0.0) You can find the used version here: [click here](https://github.com/nextcloud/all-in-one/search?l=Dockerfile&q=NEXTCLOUD_VERSION&type=). If not, simply upgrade your former installation to that version or wait until the version used in Nextcloud AIO got updated to the same version of your former installation or the other way around.
1. Take a backup of your former instance (especially from your datadirectory and database)
1. First, on the old instance, update all Nextcloud apps to its latest version via the app management site (important for the restore later on). Then take a backup of your former instance (especially from your datadirectory and database).
1. If your former installation didn't use Postgresql already, you will now need to convert your old installation to use Postgresql as database temporarily (in order to be able to perform a pg_dump afterwards):
1. Install Postgresql on your former installation: on a Debian based OS should the following command work:
```
@ -56,7 +56,7 @@ The procedure for migrating the files and the database works like this:
```
**Please note:** The exact name of the database export file is important! (`database-dump.sql`)<br>
And of course you need to to use the correct name that the Postgresql database has for the export (if `$PG_DATABASE` doesn't work directly).
1. At this point, you can finally install Nextcloud AIO on a new server/linux installation, enter your domain in the AIO interface (use the same domain that you used on your former installation) and wait until all containers are running. Then you should check the included Nextcloud version by running `sudo docker inspect nextcloud-aio-nextcloud | grep NEXTCLOUD_VERSION`.
1. At this point, you can finally install Nextcloud AIO on a new server/linux installation, enter your domain in the AIO interface (use the same domain that you used on your former installation) and wait until all containers are running. Then you should check the included Nextcloud version by running `sudo docker inspect nextcloud-aio-nextcloud | grep NEXTCLOUD_VERSION`. Also install all apps via the apps management site that were installed on the old Nextcloud installation. Otherwise they will show as installed, but will not work.
1. Next, take a backup using Nextcloud AIO's built-in backup solution (so that you can easily restore to this state again) (Note: this will stop all containers and is expected: don't start the container again at this point!)
1. Now, we are slowly starting to import your files and database. First, you need to modify the datadirectory that is stored inside the database export:
1. Find out what the directory of your old Nextcloud installation is by e.g. opening the config.php file and looking at the value `datadirectory`.