version:
cmd: rclone size dropbox: -vv --dump-bodies --log-file=/root/rcsize.log

Last part of log

2017/12/10 08:15:51 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2017/12/10 08:15:51 DEBUG : pacer: low level retry 10/10 (error too_many_requests/)
2017/12/10 08:15:51 ERROR : crypt/hm2ka8or5qp1pefhtc1e62jn50/a3ilou4jn8ufb3d8gco9d7fopqih10ig6r0lriuqa7trdie5f2og: error listing: too_many_requests/
2017/12/10 08:15:52 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2017/12/10 08:15:52 DEBUG : HTTP REQUEST (req 0xc42060a100)
2017/12/10 08:15:52 DEBUG : POST /2/files/list_folder HTTP/1.1
Host: api.dropboxapi.com
User-Agent: rclone/v1.38-217-gb48b5373β
Content-Length: 243
Authorization: XXXX
Content-Type: application/json
Accept-Encoding: gzip

{"path":"//crypt/hm2ka8or5qp1pefhtc1e62jn50/a3qbnla93bhsna36gpbq8jjsuuv31no6rgeea9hurdr5lakv9030","recursive":false,"include_media_info":false,"include_deleted":false,"include_has_explicit_shared_members":false,"include_mounted_folders":false}
2017/12/10 08:15:52 DEBUG : >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
2017/12/10 08:15:53 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2017/12/10 08:15:53 DEBUG : HTTP RESPONSE (req 0xc42060a100)
2017/12/10 08:15:53 DEBUG : HTTP/1.1 429 Too Many Requests
Transfer-Encoding: chunked
Connection: keep-alive
Content-Disposition: attachment; filename='error'
Content-Security-Policy: sandbox; frame-ancestors 'none'
Content-Type: application/json
Date: Sun, 10 Dec 2017 07:15:53 GMT
Retry-After: 300
Server: nginx
X-Content-Type-Options: nosniff
X-Dropbox-Request-Id: 56c98d6c9f4a3960c0dc57b7182eee69
X-Frame-Options: DENY

6f
{"error_summary": "too_many_requests/", "error": {"reason": {".tag": "too_many_requests"}, "retry_after": 300}}
0

2017/12/10 08:15:53 DEBUG : <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
2017/12/10 08:15:53 DEBUG : pacer: low level retry 10/10 (error too_many_requests/)
2017/12/10 08:15:53 ERROR : crypt/hm2ka8or5qp1pefhtc1e62jn50/a3qbnla93bhsna36gpbq8jjsuuv31no6rgeea9hurdr5lakv9030: error listing: too_many_requests/
2017/12/10 08:15:53 Failed to size: too_many_requests/.

Full log: https://ufile.io/i905f

@ncw any way to limit speed of requests for dropbox since I cant check size or do dedupe for past couple of days ( so far I only synced 35TB out of my 100TB+ gdrive library to dropbox )