Script to backup large file to dropbox

db-upload-chunk-backup.py

#!/usr/bin/env python

import dropbox
import os
import time

file_path = "/opt/backups/backup.tar.gz"
dest_path = "/Apps/backup/"
dbx = dropbox.Dropbox("<app-token>")
dest_today_path = dest_path + time.strftime("%Y-%m-%d") + ".tgz"

f = open(file_path)
file_size = os.path.getsize(file_path)

CHUNK_SIZE = 4 * 1024 * 1024

if file_size <= CHUNK_SIZE:
    print dbx.files_upload(f.read(), dest_today_path)

else:

    upload_session_start_result = dbx.files_upload_session_start(f.read(CHUNK_SIZE))
    cursor = dropbox.files.UploadSessionCursor(session_id=upload_session_start_result.session_id,
                                               offset=f.tell())
    commit = dropbox.files.CommitInfo(path=dest_today_path)

    while f.tell() < file_size:
        if ((file_size - f.tell()) <= CHUNK_SIZE):
            print dbx.files_upload_session_finish(f.read(CHUNK_SIZE),
                                            cursor,
                                            commit)
        else:
            dbx.files_upload_session_append(f.read(CHUNK_SIZE),
                                            cursor.session_id,
                                            cursor.offset)
            cursor.offset = f.tell()

f.close()

print ("Done: " + dest_today_path)