If you have searched FolderSync vs Autosync, or thrown Syncthing into the same search, you are shopping for Android folder sync and have probably already noticed the annoying thing about the answers: the three apps get compared as though they are three versions of one product. They are not. Two of them do roughly the same job in different packaging, and the third is solving a genuinely different problem that happens to share the word "sync".
This post sorts out which is which, so you can stop comparing feature lists and start with the shorter question: what are you actually trying to move, and where does it need to end up?
The three, described by what they do
FolderSync is an Android app that pairs a folder on your device with a folder somewhere else. Its listing describes syncing to and from local folders on the device and SD cards, a long list of cloud providers, and network protocols including FTP, SFTP, SMB and WebDAV. It also ships a file manager for browsing and moving files in those remote locations. It is the broadest of the three in terms of what it will connect to.
Autosync covers similar ground with a different shape. There is an all-in-one edition supporting a list of cloud services and network protocols, and separately a family of single-cloud apps. Its own listing is direct about the split: people who use only one cloud service may prefer the smaller, simpler single-cloud app. Its emphasis throughout is automatic syncing, keeping a device folder and a cloud folder matched without you doing anything.
Syncthing is the odd one out, and deliberately so. It describes itself as continuous file synchronization between two or more computers, with no central server, where none of your data is stored anywhere except on your own machines. There is no cloud provider in the picture. Its own downloads page leads with desktop operating systems.
So the first fork is not a feature comparison at all:
| If your goal is | What you need |
|---|---|
| A copy of a phone folder in cloud storage | A folder-to-cloud app |
| Your own devices kept in step, no cloud account | A peer-to-peer tool |
| The same folder habit across phone, tablet and laptop | See below |
How Sync runs a task
FolderSync and Autosync both describe automatic syncing in their own material. Autosync is built around it. Sync by Miciniti does not do that. It does not sync on a schedule and it does not run in the background. You create a task once, and the copy happens when you run it.
What that gives you is that nothing moves without you knowing. Every run is something you started and watched finish, which means "did my photos actually get backed up" has an answer you can see rather than assume.
Sync does not support NAS or network drives. It covers the destinations that survive the house: Google Drive, Dropbox, OneDrive, Box, Amazon S3, and drives you can unplug.
Where the comparison changes shape
Now the part that the three-way comparison usually misses.
FolderSync and Autosync are Android apps. Syncthing's own site leads with desktop operating systems. Each of them is built around syncing a folder on one device.
The question a lot of people are actually asking is the one after that. Your photos are on an Android phone. Your work documents are on a Windows laptop. There is an iPad in the house that everyone uses. You do not want three different mental models and three different apps for what is fundamentally one habit: put a copy of this folder somewhere else.
Sync by Miciniti is built for that shape. It runs on iPhone and iPad, Android, Mac and Windows, with the same account, the same five operations, and the same task setup on every one of them. It connects to Google Drive, Dropbox, OneDrive, Box and Amazon S3, and to USB and external drives. It has been shipping across platforms since 2014.
That is the row the Android-only apps structurally cannot match.
The five operations, since the names matter
If you do come from FolderSync or Autosync, the one thing that will trip you up is that Sync makes you name what you want instead of offering one "sync" button. There are five choices, and only one of them can delete:
| Operation | Direction | Deletes? |
|---|---|---|
| Backup | Device → drive | Never |
| Backup Sync | Device → drive | Never |
| Restore | Drive → device | Never |
| Restore Sync | Drive → device | Never |
| Full Sync | Both ways | Yes, mirrored both ways |
The trap is the word Sync inside "Backup Sync" and "Restore Sync". It means incremental, only what changed since the last run. It does not mean two-way. Those two operations copy in one direction, exactly like their plain counterparts, just faster on a folder that is mostly already copied.
Full Sync is the only operation that mirrors deletions, in both directions. It is the right tool for keeping two locations identical and the wrong tool for anything you would call a backup, because a file you delete by accident on one side leaves on the other side too. The five modes are covered properly here, and the broader backup versus sync distinction is worth ten minutes if the difference has ever bitten you.
Setting up Android folder sync
If you are moving over from a folder-pair app, the setup will feel familiar:
- Install Sync and connect one drive. Google Drive, Dropbox, OneDrive, Box or Amazon S3, any one of them is free.
- Create a task. Pick the local folder as the source. On Android that can be any folder you choose, including
DCIMif photos are what you care about. - Pick the destination folder on the drive.
- Choose Backup. It copies one way and never deletes on the drive.
- Run it, and watch it finish.
Step 5 is the one that is different from what you are used to, and it is the whole trade discussed above. There is a fuller walkthrough of the photo case in backing up Android photos without Google Photos.
What Sync does not do
Stated plainly, so nothing here is a surprise after you install it:
- No automatic, scheduled or background syncing. Tasks run when you run them.
- No NAS or network drives. No SMB, FTP or WebDAV.
- No direct cloud-to-cloud transfer. Moving files between two providers is a Restore down followed by a Backup up, which works but is two steps.
- No photo library integration on iPhone, iPad or Mac. The Android photo workflow above uses
DCIMas an ordinary folder; there is no equivalent on Apple platforms yet.
Everything not on that list is what Sync is built for. If storage location is the question rather than the app, cloud versus external drive versus NAS covers where backups are best kept.
So which one
- A copy you can see finish: Sync runs each task when you start it, so every backup is one you watched complete.
- A copy that survives the house: cloud drives, or a USB drive you can unplug, rather than a box on the same network.
- Everything else, and especially more than one device: this is where the Android-only apps run out of road. Your phone is not the only place your files live. A photo on Android, a document on a Mac and an archive on a USB drive are the same problem, and handling them with three different tools is how copies go missing.
- One account, five operations, iPhone, iPad, Android, Mac and Windows: that is the case Sync is built for, and it is the one an Android-only app structurally cannot cover.
Sync is free to start: connect any one drive at no cost, ad-supported, and set up your first Backup task in a few minutes. Additional drives and features unlock with a Sync subscription or a one-time lifetime purchase, whichever you prefer. Available on iPhone and iPad, Android, Mac, and Windows.
The useful test is not which app has the longest feature list. It is whether the copy is real. Set up a single folder this week, run a restore next week, and find out before you need it.
Frequently asked questions
What is the difference between FolderSync and Autosync?
Both are Android apps that pair a folder on your device with a folder in cloud storage. The clearest difference is how they are packaged. FolderSync's listing describes one app covering a long list of cloud providers plus FTP, SFTP, SMB and WebDAV, and it includes a file manager for browsing those remotes. Autosync sells an all-in-one edition alongside a family of single-cloud apps, and its own listing suggests that people who use only one cloud service may prefer the smaller single-cloud app instead. Either way the shape is the same: an Android app pairing an Android folder with a remote. The question that decides more setups is not which of the two you pick, but whether Android is the only place your files live.
Is Syncthing an alternative to FolderSync?
Only if you want a different thing. Syncthing describes itself as continuous file synchronization between two or more computers, with no central server and your data stored nowhere but on your own machines. There is no cloud account in the model at all, which is the point of it. FolderSync and Autosync are built to move files between your device and a cloud provider. So the two answer different questions. Syncthing's model keeps your own machines in step with each other; there is no copy anywhere but on those machines. If what you want is a copy that survives losing the devices themselves, that is a different job.
What is the best Android folder sync app?
The one that still works when your files are not only on Android. FolderSync and Autosync are Android apps, and Syncthing's own downloads page leads with desktop operating systems. Sync by Miciniti pairs a folder on your Android phone, including DCIM for photos, with Google Drive, Dropbox, OneDrive, Box, Amazon S3 or a USB drive, and runs the same task setup on iPhone and iPad, Mac and Windows from the same account. If you have a phone, a laptop and a tablet that are not all the same brand, that is most of the decision.
Do these apps sync automatically, and does Sync by Miciniti?
FolderSync and Autosync both describe automatic syncing in their own listings. Sync by Miciniti does not work that way. It does not sync on a schedule or in the background. You set a task up once, and it runs when you run it. You get an explicit record of what was copied and when, because a backup nobody has ever watched finish is not one you have tested.
Can I sync an Android folder to a NAS or network drive with Sync by Miciniti?
No. Sync by Miciniti does not support NAS or network drives, and there is no SMB, FTP or WebDAV support in it. It connects to Google Drive, Dropbox, OneDrive, Box and Amazon S3, plus USB and external drives, plus local folders on the device. If the copy has to land on a box inside your house, that is not a job Sync does. If it has to land somewhere that survives the house, that is exactly what it is for.
What is the best FolderSync alternative for someone with more than one device?
If the reason you are looking for an alternative is that FolderSync only helps you on Android, then the useful comparison is not another Android app. Sync by Miciniti covers iPhone and iPad, Android, Mac and Windows with one account and one way of working, so the folder-to-cloud habit you build on the phone is the same on the laptop. Sync does not sync in the background or support NAS drives; it runs the tasks you start, on every device you own.
