Added missing info about backup restore also accepting a backup tarba…

…ll additional to the uncompressed backup dir.

.drone.sec

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README.md

@@ -139,10 +139,12 @@ To restore an OTRS backup file (not necesarily created with this container) the
 
 * `OTRS_INSTALL=restore` Will restore the backup specified by `OTRS_BACKUP_DATE`
 environment variable.
-* `OTRS_BACKUP_DATE` is the backup name to restore, in the same *date_time* format that the OTRS backup
-script uses, for example `OTRS_BACKUP_DATE="2015-05-26_00-32"` (This is the notation that the backup script that comes with OTRS uses).
+* `OTRS_BACKUP_DATE` is the backup name to restore. It can have two values:
+   - Uncompressed backup file: A directory with its name in the same *date_time* format that the OTRS backup
+script uses, for example `OTRS_BACKUP_DATE="2015-05-26_00-32"`. A backup file created with this image or with any OTRS installation will work (the backup script creates the directory with that name).
+   - Compressed backup file: A gzip tarball file created by OTRS.
 
-Backups must be inside the */var/otrs/backups* directory (you should host mount it).
+Backups must be inside the */var/otrs/backups* directory (host mounted by default in the docker-compose file).
 
 ## Upgrading