I often need the following function: I wish to make a copy operation (usually from my phone to the cloud). I wish to copy a set of folders and subfolders with contents/files.

I wish all NEW files to be copied but NO FILES SHOULD BE REPLACED in the target.

One reson for doing this is that earlier backups in the cloud are incomplete. Copying to the cloud can consume a lot of time and bandwidth, I therefore wish to skip overwriting files that are already in the cloud. I wish to only copy NEW files that not yet reside in the cloud.

It would be like pressing "overwrite" for every duplicate folder but "skip" for every duplicate file, in a copy dialogue.

I have tried the app ES File Explorer. It handles all clouds relevant to me (Dropbox, Drive, Mega, OneDrive) in an efficient way. But I can not find the function described above. Files and folders are treated in the same way regarding overwrite/skip.

An example could be:

I make a backup of 1000 files to the cloud. The connection breaks after 900 files. I am not sure which 100 files still have to be copied.

I just want to restart the 1000 file backup and only the missing 100 files should be copied. This should work no matter in which folders/subfolders the missing files are located.

It is very simple to do manually. (Dilbert's boss could do it. ;) ) Just press "overwrite" for duplicate folders and "skip" for duplicate files. But I can't sit and do that for hours. There ought to be a file manager that does it for me?

  • FolderSync can sync the files with various cloud services and appears to have a support for Tasker as well. Perhaps, that's what you need.
    – Firelord
    Dec 25, 2015 at 15:17
  • Thanks Firelord. I just set up FolderSync to repair a large, broken backup to OneDrive. First impression of app interface and how it works look promising. I'll come back with another report later. This could be a solution. (Tried to up-vote your comment, but not allowed for me.)
    – cvr
    Dec 25, 2015 at 17:36
  • FolderSync seems to be a great app. ES file explorer did well with DB, Mega & Drive. But I think that ES got thrown out by OneDrive everytime my poor connection stalled. After every 50-100 files ES crashed. FolderSync has pushed up 4000-5000 without any problems already. So far FolderSync gets a top rating from me. Also works independently with simple interface and many options.
    – cvr
    Dec 26, 2015 at 9:01
  • Well then, consider posting an answer if it is working for you.
    – Firelord
    Dec 26, 2015 at 14:10
  • Ok. Will do that when I have tried some more functions. Thanks for good tip.
    – cvr
    Dec 26, 2015 at 14:12

1 Answer 1


The app FolderSync solves the problem. You can choose whether to overwrite target files or not. (Even if you choose not to overwrite individual files, you can still include new files in subfolders into your backup, if you want.)

You can also choose whether to only backup/sync modified files (date or MD5 options). Under this option, a file deleted in the cloud, will not be uploaded again, unless modified.

The app has many options e.g.

  • synch both directions or just f.ex to (or from) the cloud

  • include/exclude subfolders

  • include/exclude filenames containing user defined strings

  • synch deletions is optional (files deleted on the phone will then also be deleted in the cloud)

  • and many more

It is able to handle thousands of files and also works under a less than optimal Internet connection. It connects to a multitude of clouds. It does scheduling and works discretely in the background.

So far it has solved my copy needs for the cloud.


Another good app is ES File Explorer. It is a file manager (not a sync program). It also handles the common clouds (I think you need "Pro" version for cloud Mega.)

ES File Explorer works well. But if you choose "do not overwrite files" you can not include subfolders. (Files and folders are treated in the same way with respect to overwrite/skip.) At least I couldn't make it work. For me it also had problems communicating with Microsoft cloud OneDrive for large backups. Maybe because my Internet connection is somewhat poor. "ES" functions well with other clouds over my Internet connection, though.

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