@muhammadazkaar This message just warns you about PHP version differences which can result in issues after restoration. If you are sure that all the plugins and themes are compatible with PHP version 7.0.33 then you can ignore this message. If you are not sure, please downgrade PHP version 5.5.38.
Hello i have the same problem restoring a backup file here is the log
Date: 2019-03-04 10:33:00
Backup Method: reload
Restore Method: external
User Mode: free
BackupGuard version: 1.1.82
Supported archive version: 5
Database prefix: wphn_
Site URL: http://www.j-emm.it
Home URL: http://www.j-emm.it
Uploads path: /home/ukgravel/public_html/j-emm.it/wp-content/uploads
Site installation: standard
OS: Linux
Server: Apache
User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36
PHP version: 5.6.40
SAPI: cgi-fcgi
MySQL version: 5.6.40
Int size: 8
Int lib: bcmath
Memory limit: 768M
Max execution time: 120
Disk free space: 933GB
Archive Size: 203.4MB (203445528 bytes)
Environment: WordPress 5.1
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Archive version: 5
Archive database prefix: wp_
Archive site URL: http://www.j-emm.it
2019-03-04 10:33:00: SGException: Seems you have changed database prefix. You should keep it constant to be able to restore this backup. Setup your WordPress installation with wp_ datbase prefix. [File: /home/ukgravel/public_html/j-emm.it/wp-content/plugins/backup/com/lib/SGArchive.php, Line: 483, URL: /bg_restore.php?k=4f2f8b2d5a7ddc890ba7123a21a1bdcc&action=awake]