I found a user-friendly and easy Migration process third-party tool that quickly migrates 'protected-password' OST files into Office 365 including Emails properties or mailbox attachments such as-: Task, Emails properties ( To, Date, From, Subject and etc.), Mailbox attachments, Inbox, Outbox, Draft, Contacts, Calendar items and etc. This tool will help you in Export data from inaccessible OST files to Office 365 with it also save then items into multiple files formats such as- PST, Gmail, Zimbra, MSG, EML, EMLX, vCard, ICS, PDF, OLM, NSF, Office 365, Live Exchange and etc.

• Split large size of OST files to the smaller part
• Batch Option to selects multiple OST files items.
• Messages filtering option to Convert OST to MBOX by according to Date and etc.
• Convert OST Contacts to the vCard file format.
• Restore Password-protected OST files into Outlook.

More Info-:  OST to Office 365 Migration

Check out Advik Gmail to PDF Converter (https://www.adviksoft.com/gmail/pdf.html) for Windows. This software is specially developed for Gmail users as there is no official method is avaialble to batch export Gmail emails to PDF.
Steps to export Gmail emails to PDF in batch are as follows;

1. Run Advik Gmail to PDF Converter in your system.
2. Enter your Gmail login credentials
3. Select PDF as Saving option from list.
4. Click Convert and anylyse the process.

Done! This is how you can export Gmail email to PDF in bulk.
 

hi, I want to back up my Gmail account in local disk, is there any software that creates a backup then suggest the best software

Email Backup Wizard is one of the best tool that creates the backup of Google Apps mail to Office 365 along with all the attached items. This tool create backup with all the meta properties and formatting in just a few moments.

Features and Benefits

• Direct Migrate Google Apps mail to Office 365
• Selective emails backup with the help of filter option
• Create complete backup of Google Apps mails
• Multiple Google Apps emails migration at same time
• Backup with all Google Apps attachments to Office 365
• Compatible with all the editions of Windows OS

Read more: https://gallery.technet.microsoft.com/google-apps-to-office-365-a71a5480

As there isn't any official method. So we'll go for direct approach by using OLM to Gmail import utility. Using this tool you can import your Mac Outlook emails to Gmail without any file size limitation.
Thanks