UpdraftPlus won’t restore WordPress SQL database on my NAS box

I am desperately wanting to restore my encrypted SQL database in my WordPress installation backed up with UpdraftPlus on my Synology NAS box. I get the error message “Your web server’s PHP installation has these functions disabled: gzopen, gzread.” I have had problems trying to decrypt this .gz backed up database with other tools such as 7Zip & WinRAR. I didn’t realise that UpdraftPlus uses this encryption method for backups which is making me worried about getting my website up and running again. I have been backing up on UpdraftPlus for ages without knowing it may not be suited to websites on these NAS boxes. Is there a work around for this? Thank you very much.