PostgreSQL File System Based Backup Restartability

Is PostgreSQL file system based backup restart-ability possible ?

Steps

- Database size is 1 TB

- I'll execute pg_start_backup('label');

- I will traverse through the DATA directory to get the list of directories and files. 

- I will start moving the files to backup media. ( over network )

- When I'm half way (500GB done), network error happens. So movement of files is halted.

- Network issue is resolve after 30 minutes (In this time files might have got deleted or added with creation/deletion of database/tables )

- I'll resume moving the files to backup media from where it had halted.

- When movement of files is done, I'll execute pg_stop_backup()

- I'll move all the transaction logs that got archived to backup media.

Is PostgreSQL server recovery to a consistent state possible with backup content obtained from above steps ?

Thanks

Girish