Cloud storage keeps your files on a provider’s servers so you can reach them from any device and share them with others. It is also one of the easiest places to make a costly mistake: choosing on price alone, then discovering that the service does not sync the way you work, or that you cannot get your files out. Plans and prices change often, so this guide focuses on what to compare. Check each provider’s current details before you decide.
Cloud storage, sync and backup are different things
- Storage keeps files online so you can open and share them.
- Sync mirrors a folder across your devices. If you delete a file in one place, it may disappear everywhere.
- Backup keeps separate copies so you can restore files after loss, damage or an accident.
Many services combine these, but they do not all do each one well. Work out which of the three you actually need.
Eight things to compare
- Space and real cost. Compare the free allowance and the price per month or year for the space you need, and check whether it is shared with email or photos.
- Device support. Make sure there are apps for every phone and computer you use, and that the web version works well.
- Sync behavior. Check whether you can choose which folders sync, keep files online only, and work offline.
- Sharing and permissions. Look for links with passwords or expiry dates, and separate permissions to view or edit.
- Security. Look for encryption in transit and at rest, and for support for two-factor authentication on your account.
- Privacy. Read where data is stored, who can access it and how the provider uses it. Some services offer end-to-end encryption, which means even the provider cannot read your files, though it can limit features such as search or recovery.
- Version history and recovery. See how long deleted or changed files can be restored, since this protects you from mistakes and some kinds of malware.
- Leaving the service. Check how easy it is to download all your files and what happens to them if you stop paying or the account is closed.
Match the service to your situation
- If you mostly use one ecosystem, such as one phone and computer brand, the built-in service often integrates best.
- If you work across many kinds of devices, favor a service with good apps everywhere.
- If you handle sensitive files, put privacy and encryption first, and accept fewer features.
- If you collaborate with others, prioritize sharing, permissions and shared editing.
Do not rely on a single copy
A common rule is to keep three copies of important files, on two different kinds of storage, with one stored elsewhere. Cloud storage can be one of those copies, but not the only one. Keep another copy on an external drive, and test restoring a file now and then to be sure it works.
The short version
Decide whether you need storage, sync or backup, compare the eight points above, protect the account with two-factor authentication, and keep a second copy of anything you cannot replace.
